ChatReviewSept30

Transcript of Chat Class September 30, 2005

\TIMOTHY BEAL>>i was just wondering what to concentrate studying on for midterm

TIMOTHY BEAL>>i havent had any problems really doing the work online and i follow you pretty good in class but is there any specific area to concentrate on

TIMOTHY BEAL>>oh and im also doing the quiz thats due today by 6 pm

TED GOERTZEL>>I went over that in class yesterday, it's in the class notes. Here is what I said:If you have not done so already, this is the time to read the textbook. We have covered chapter One, Two, Three and Four. There are also summaries of this material in the Workbook on pages 19, 67 and 91. You should be able to answer the questions listed under "before you begin". The test will be mostly multiple choice, so probably the most useful for reviewing is the "Review Glossary" at the end of each chapter in the text. There will also be a page of statistics questions similar to those we have had in exercises:

*+**** PATRICK--HIDALGO entered Fal2005_50920301_goertzel_Room1. Friday, September 30, 2005 11:01am

PATRICK HIDALGO>>hello

TED GOERTZEL>>If you have a book with you, you might want to look at some of the questions there and ask me about them.

TIMOTHY BEAL>>okey dokey thanks

PATRICK HIDALGO>>will do

TED GOERTZEL>>Welcome Patrick, where are you?

DANIEL POWELL>>ok

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PATRICK HIDALGO>>im in the dorms right now

LILIANA FUENTES>>hello

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TED GOERTZEL>>Hi Liliana, where are you?

LILIANA FUENTES>>in the dorms

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PATRICK HIDALGO>>professor, will there be a lot of questions using standard deviation?

TED GOERTZEL>>Why don't I ask you some questions while we are waiting for 11:15?

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TED GOERTZEL>>Would you say that a negative correlation is just as good as a positive one?

TIMOTHY BEAL>>yeah

LILIANA FUENTES>>no

COLLEEN MCCAUSLAND>>sure

TED GOERTZEL>>Yes, a negative correlation is just as good as a positive one in the sense that it explains just as much

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TED GOERTZEL>>Often whether something is negative or positive is just a matter of wording.

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TED GOERTZEL>>Thus the correlation between dieting and gaining weight is negative, we hope.

TED GOERTZEL>>But the correlation between dieting and losing weight would be positive.

*+**** JAY--HILL entered Fal2005_50920301_goertzel_Room1. Friday, September 30, 2005 11:07am

TED GOERTZEL>>Let's try a level of measurement question.

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TED GOERTZEL>>In our class, 60% of the students are Catholid, 30% are Protestant, 5% are Jewish and 5% other

TED GOERTZEL>>What level of measurement did that statement imply?

ROBYN DUFRAIN>>nominal

PATRICK HIDALGO>>nominal

JAY HILL>>nominal

TERRI ANN--SAUTTER>>nominal

RICHARD STRONSKI>>nominal

TIMOTHY BEAL>>nominal

TED GOERTZEL>>OK, how did you know it was nominal?

COLLEEN MCCAUSLAND>>nominal

DANIEL POWELL>>nominal

PATRICK HIDALGO>>no order

TIMOTHY BEAL>>its categorical with no order

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ROBYN DUFRAIN>>there were differnt categories, no order was implied

DANIEL POWELL>>religion is categories

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TED GOERTZEL>>Good!

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COLLEEN MCCAUSLAND>>hey timm

TED GOERTZEL>>Does anyone have a question for me?

RICHARD STRONSKI>>no flirting please

COLLEEN MCCAUSLAND>>haha

RICHARD STRONSKI>>jk

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ISABEL LOPEZ>>ISABEL LOPEZ

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TED GOERTZEL>>flirting is OK before 11:15, class hasn't formally started yet

RICHARD STRONSKI>>well in that case

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CORRINE MARTIN>>is the margin of percent error the only formula we need to know?

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RICHARD STRONSKI>>standard deviation

CORRINE MARTIN>>ok right

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TED GOERTZEL>>We will do formulas for margin of error for means and proportions, also sample size and standard error

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TED GOERTZEL>>Shall we try going over the statistical calculations here, or focus on multiple choice questions?

TED GOERTZEL>>Or both?

RICHARD STRONSKI>>M.C.

ISABEL LOPEZ>>BOTH

JAY HILL>>multile choice

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ROBYN DUFRAIN>>multiple choice

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HEIDI BAITINGER>>Both

CORRINE MARTIN>>multiple choice

CASEY STRONSKI>>both

MATTHEW WAKELEE>>bot

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DANIEL POWELL>>both

ISABEL LOPEZ>>CAN YOU EXPLAIN HOW TO COMPUTE THE MARGIN OF ERROR FOR 600?

TED GOERTZEL>>Some peole are sending "private messages" I don't know how you did that, but everything in the chat room should be public

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TED GOERTZEL>>Everything will appear in the printout

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COLLEEN MCCAUSLAND>>how about now

COLLEEN MCCAUSLAND>>lol

JAY HILL>>if you could give us an example of the standard dev close o the one on the test would be great

RICHARD STRONSKI>>they are still using their flirting time professor

*+**** LASHAWN--ANTHONY entered Fal2005_50920301_goertzel_Room1. Friday, September 30, 2005 11:13am

COLLEEN MCCAUSLAND>>no we are not!

VINCENT CONSTANTINE>>how about just giving us the test and letting us look over it over the weekend

FRANCESCA CRINITI>>that sounds good

JAY HILL>>sounds good to me too

COLLEEN MCCAUSLAND>>good idea!

CASEY STRONSKI>>sounds good

MATTHEW WAKELEE>>i agree

TED GOERTZEL>>It is only 11:13, two minutes to finish flirting...

LASHAWN ANTHONY>>lol

YAIZA CRUZ>>lol

COLLEEN MCCAUSLAND>>we arent flirting!

KARLA BLEVINS>>sounds good to me

MATTHEW WAKELEE>>haha

VINCENT CONSTANTINE>>not the answer I was looking for

TED GOERTZEL>>I'm going to give you some of the test items, but not all of them.

RICHARD STRONSKI>>i was referring to the private messages

*+**** BRIDGETTE--WILSON entered Fal2005_50920301_goertzel_Room1. Friday, September 30, 2005 11:14am

TIMOTHY BEAL>>professor goertzel to send private messages to

COLLEEN MCCAUSLAND>>i never thought id have a class online

TIMOTHY BEAL>> to get it back to normal u just unclick

JAY HILL>>can we then print this out and bring it with us to the exam

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TED GOERTZEL>>Jay, you can print this out but you can't consult it during the exam

YAIZA CRUZ>>just print it out and use it to study jay

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TED GOERTZEL>>However, I will hand out a sheet with formulas during the exam

FRANCESCA CRINITI>>i think jay was asking for an open notes test

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TED GOERTZEL>>You can find that sheet at http://crab.rutgers.edu/%7Egoertzel/StatisticsFormulas.html

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RICHARD STRONSKI>>the margin for 600 would be the square root of 600 divided by 1

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RICHARD STRONSKI>>am i right

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DANIEL POWELL>>so we don't need to remember how to computer standard dev. or margin of error?

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TIMOTHY BEAL>>i love formulas :)

MATTHEW WAKELEE>>that would be great

TED GOERTZEL>>OK, it is 11:15 and class is beginning. Since there are so many, try not to send too many messages

MATTHEW WAKELEE>>

CASEY STRONSKI>>yes we do!!

TED GOERTZEL>>Let me start with the question of the margin of error for a sample of 600

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TED GOERTZEL>>Here is the formula:   If you are given a sample size and need to know the margin of error use    M = 1/sqrt(N). M in this case is the Margin of Error as a proportion (not a percent). For your final answer, convert the result to a percent.

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TED GOERTZEL>>So the first thing is to take the square root of 600.

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HEIDI BAITINGER>>would the answer be 4.08%?

RICHARD STRONSKI>>lets not jump to conclusions

TED GOERTZEL>>yes 24.49 is the square root of 600

VINCENT CONSTANTINE>>I believe 4.08% is correct

LASHAWN ANTHONY>>d24.49 would be the sqrt

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HEIDI BAITINGER>>Thankyou!!!

TIMOTHY BEAL>>dont you round that up though

TIMOTHY BEAL>>or no

LASHAWN ANTHONY>>no i dont think so

TED GOERTZEL>>Vincent is right, if you put 1 in a calculator, hit divide by and enter 24.49 you get .0408

TED GOERTZEL>>We could round that to 4.1%, but I would also accept 4.08

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TIMOTHY BEAL>>what would webct accept

STEPHEN AIELLO>>are you going to give us the formulas for the test or do we have to memorize them

TED GOERTZEL>>Now suppose our sample of 600 had 150 black respondents

TED GOERTZEL>>What would the margin of error be for the black respondents?

MATTHEW WAKELEE>>no idea

COLLEEN MCCAUSLAND>>i think he said he is giving us a formula sheet before the test

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TIMOTHY BEAL>>8.1%

TED GOERTZEL>>It is the same formula we used before M =1/SQRT(N)

VINCENT CONSTANTINE>>8.16

RICHARD STRONSKI>>8.2%

MATTHEW WAKELEE>>oh okay

HEIDI BAITINGER>>8.1%

VINCENT CONSTANTINE>>8.16%

ROBYN DUFRAIN>>8.1%

RICHARD STRONSKI>>gosh

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YAIZA CRUZ>>for the test your going to specify how many decimal places you want right?

KRISTIN CURTIS>>8.16%

ALEXIS HEWES-EDDINGER>>8.16%

LILIANA FUENTES>>8.16%

TED GOERTZEL>>But in this case the N is 150 because only the blacks count - 8.2% is correct

RICHARD STRONSKI>>shizzaaaaam

MATTHEW WAKELEE>>oh

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LASHAWN ANTHONY>>good because thats what i got

HEIDI BAITINGER>>would you accept 8.16%

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TED GOERTZEL>>Now we go backwards. Suppose we want a margin of error of 3%. How large a sample do we need to get it?

TIMOTHY BEAL>>100

TIMOTHY BEAL>>100

TIMOTHY BEAL>>1000

TIMOTHY BEAL>>geez

ALEXIS HEWES-EDDINGER>>100

TED GOERTZEL>>The formula is:   If you are given a margin of error and asked how large a sample you need, use N = 1/ M(squared).

LASHAWN ANTHONY>>i was thinking 900

TED GOERTZEL>>First we convert the 3% to a proportion, it becomes .03.

RICHARD STRONSKI>>1110

ROBYN DUFRAIN>>1111

LILIANA FUENTES>>1111

HEIDI BAITINGER>>1111

ALEXIS HEWES-EDDINGER>>1111

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TED GOERTZEL>>Then we square the .03 getting .0009

KARLA BLEVINS>>i got 1111

TED GOERTZEL>>Then we divide .0009 into 1, getting 1111.11

NICOLE CHRISTISON>>1111

TED GOERTZEL>>We might round this up to 1112 because it is always better to have one more than you need

LASHAWN ANTHONY>>o ok

MATTHEW WAKELEE>>do you always want two decimal places than

LASHAWN ANTHONY>>ok i c

TED GOERTZEL>>Suppose we want a margin of error of 3% for the men and two for the women?

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TED GOERTZEL>>Matthew - one number after the decimal is OK, but two are also OK

BRIDGETTE WILSON>>hi

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RICHARD STRONSKI>>hey whats cooking good looking

TED GOERTZEL>>You should be able to do the question about a 3% margin of error for two groups in your head

BRIDGETTE WILSON>>All my msgs were showing up private

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ROBYN DUFRAIN>>3612

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TED GOERTZEL>>It was 1112 for the sample as a whole, so to get it for two groups we just double it

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TED GOERTZEL>>it is 2224.

MATTHEW WAKELEE>>nice....i likie

TED GOERTZEL>>Berna, don't click on "send url" just type your question and hit the Enter key

IVETTE RIVERA>>Ivette Rivera About how many of the measurements exercise are going to be on the exam?

YAIZA CRUZ>>now its 224 as a whole?

RICHARD STRONSKI>>wait professor u got me tripping on that one

LESLIE SCOTT>>what did I miss

BERNA BAEZ>>okay

YAIZA CRUZ>>2224* sorry

TED GOERTZEL>>Suppose we need a 5% margin of error for each of the five counties in South Jersey

BERNA BAEZ>>i did get 1111.11

ROBYN DUFRAIN>>2000

JAY HILL>>2000

TED GOERTZEL>>First, what sample do we need for a 5% margin of error?

LASHAWN ANTHONY>>2000

JAY HILL>>400

YAIZA CRUZ>>2000

HEIDI BAITINGER>>2000

KAREN GARCIA>>400

RICHARD STRONSKI>>600

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ISABEL LOPEZ>>2000

RICHARD STRONSKI>>400

NICOLE CHRISTISON>>400

FRANCESCA CRINITI>>400

IVETTE RIVERA>>2000

ALEXIS HEWES-EDDINGER>>2000

YAIZA CRUZ>>we need 400 people

DANIEL POWELL>>400

CORRINE MARTIN>>400

BRIDGETTE WILSON>>We should use the formula 3*(n=1/m2) right?

TED GOERTZEL>>We need 400 for a 5%, but it is 400 for each county, so 2000 total is correct

JAY HILL>>you need a 400 for each county

LILIANA FUENTES>>2000

TIMOTHY BEAL>>400 each

HEIDI BAITINGER>>400*5=2000

TED GOERTZEL>>Let's try a standard deviation, that will be the most challenging for this medium

IVETTE RIVERA>>2000

FRANCESCA CRINITI>>so how ever many categories you are askin us to find, find the error and multipy it

LESLIE SCOTT>>that is what i dont understand

BRIDGETTE WILSON>>Hi Ivette

MATTHEW WAKELEE>>can you go over that last one real quick--sorry

JAY HILL>>will the stsndard dev question be weighted the same as all of the other questions?

MATTHEW WAKELEE>>i got confused when that new formula came up

TED GOERTZEL>>In the sampling question, if you need a margin of error for several groups, you need a separate sample for each group

BERNA BAEZ>>400

TED GOERTZEL>>So for five groups, the sample is five times as large, not 400 but 400 times 5

ISABEL LOPEZ>>ITS 400*5 BECAUSE YOU NEED 400 FOR EACH COUNTY

TED GOERTZEL>>Here are three numbers: 55, 85 and 25. What is the mean?

BERNA BAEZ>>2000

IVETTE RIVERA>>Hola I am at the library! where R U?

IVETTE RIVERA>>5

RICHARD STRONSKI>>55

BRIDGETTE WILSON>>Prof. Goertzel would 15 degrees to 25 degrees be considered an example of an interval measurement?

NICOLE CHRISTISON>>55

YAIZA CRUZ>>55 is the mean

LASHAWN ANTHONY>>55

BRIAN WASILEWSKI>>55

FRANCESCA CRINITI>>55

ANDREA BIRD>>55

COLIN DONOHOE>>55

ROBYN DUFRAIN>>55

ALEXIS HEWES-EDDINGER>>55

ISABEL LOPEZ>>55

MATTHEW WAKELEE>>55

KRISTIN CURTIS>>55

CORRINE MARTIN>>55

DANIEL POWELL>>55

KARLA BLEVINS>>55

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LESLIE SCOTT>>55

IVETTE RIVERA>>55

TERRI ANN--SAUTTER>>55

CHRIS CRENSHAW>>55

COURTNEY CAMPBELL>>55

JOHNNY HUFFMAN>>55

ISABEL LOPEZ>>55

MATTHEW WAKELEE>>55

TIMOTHY BEAL>>55

TED GOERTZEL>>OK, 55 is the mean. (I can't answer other questions now, let's keep on one topic)

LILIANA FUENTES>>55

HEIDI BAITINGER>>55

KAREN GARCIA>>55

ALEXIS HEWES-EDDINGER>>55

RICHARD STRONSKI>>yah mean

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LESLIE SCOTT>>55

KAREN GARCIA>>55

TED GOERTZEL>>Yes, 55 is the mean

TIMOTHY BEAL>>55

PATRICK HIDALGO>>hello?

MATTHEW WAKELEE>>3*(n=1/m2)

SHAREDA COLEMAN>>can you read this cause my messagees are coming up private

VINCENT CONSTANTINE>>some of the computers are freezing

IVETTE RIVERA>>55

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CHRIS CRENSHAW>>55

YAIZA CRUZ>>?

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ISABEL LOPEZ>>

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LASHAWN ANTHONY>>im at home and the same thing happened here

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CHRIS CRENSHAW>>55

FRANCESCA CRINITI>>yea shareda, i see it

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COLIN DONOHOE>>is the standard deviation 42.45

JAY HILL>>is this thing on??

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BRIDGETTE WILSON>>We have spent enough times on the formulas can we move on?

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BERNA BAEZ>>55

KAREN GARCIA>>Prof - the questions in regards to nominal, interval, ordinal, etc will they be phrased like they were in the original quiz or in the format that you gave in the review for the test

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NICOLE CHRISTISON>>test

CASEY STRONSKI>>now what?????

TED GOERTZEL>>This stopped working?

LESLIE SCOTT>>that would be a interval measurement

MATTHEW WAKELEE>>whats that for?

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ISABEL LOPEZ>>55

IVETTE RIVERA>>

LESLIE SCOTT>>can we do another question with standard deviation

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TED GOERTZEL>>The applet seems to be overloaded, let me just call on one or two p eople to answer

BRENT GRUNOW>>55

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CASEY STRONSKI>>

TIMOTHY BEAL>>this thing is slowing up

NICOLE CHRISTISON>>test

ISABEL LOPEZ>>WHAT HAPPENED

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LASHAWN ANTHONY>>is webct acting up?

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CHRIS CRENSHAW>>this sucks

BRIDGETTE WILSON>>We have spent enough time on formulas can we move on?

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RICHARD STRONSKI>>this process is getting slow

YAIZA CRUZ>>Im lost

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ISABEL LOPEZ>>YES, THAT IS INTERVAL MEASUREMENT

CASEY STRONSKI>>????

VINCENT CONSTANTINE>>There are too many people on here at the same time

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SHAREDA COLEMAN>>prof goertzel my screen keeps freezing can you read this

BRIDGETTE WILSON>>Can we move on we have spent enough time on formulas?

ISABEL LOPEZ>>PROF THERE ARE TOO MANY PEOPLE LOGGED ON AND THE SYSTEM KEEPS CRASHING

BERNA BAEZ>>what's going on

IVETTE RIVERA>>55

LESLIE SCOTT>>can we do another question with standard deviation

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CASEY STRONSKI>>Is anyone really getting anything out of this

TED GOERTZEL>>Once we get the mean, we can go onto the standard deviation.

LESLIE SCOTT>>

IVETTE RIVERA>>55

CORRINE MARTIN>>it keeps freezing because it is overloaded

CHRIS CRENSHAW>>extend the exam and we'll pick it up on monday

SHAREDA COLEMAN>>hello?

YAIZA CRUZ>>yea Im having a problem with the chat too!

ALEXIS HEWES-EDDINGER>>this doesnt seem to be working

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YAIZA CRUZ>>awwww man!

ISABEL LOPEZ>>YES THAT WOULD BE INTERVAL MEASUREMENT

CORRINE MARTIN>>we should do one topic at a time so everyone doesn't get confused

YAIZA CRUZ>>how are we supposed to know when your calling on people when we dont see cant see anything

BERNA BAEZ>>it frozed

ROBYN DUFRAIN>>is the standard deviation for 55, 85, 25 30

IVETTE RIVERA>>

RICHARD STRONSKI>>i agree with chris

SHAREDA COLEMAN>>wait r we postponing the test

TED GOERTZEL>>Let me just do this example without people jumping in, because it seems to be overloaded

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TED GOERTZEL>>EVERYBODY STOP TYPING AND LET ME CALL ON PEOPLE - IT IS FREEZING UP

LESLIE SCOTT>>

IVETTE RIVERA>>55

COLLEEN MCCAUSLAND>>yeah you can say that

ROBYN DUFRAIN>>SD= 30?

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PATRICK HIDALGO>>hello?

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TED GOERTZEL>>I CAN DO A STANDARD DEVIATION ONCE PEOPLE STOP OVERLOADING IT

IVETTE RIVERA>>55

LESLIE SCOTT>>d

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TED GOERTZEL>>Please do not type anything unless I ask you a question

LESLIE SCOTT>>

SHAREDA COLEMAN>>hello?

LASHAWN ANTHONY>>i cant see whats being typed until a few minutes

IVETTE RIVERA>>55

TED GOERTZEL>>I am going to do some multiple choice questions and call on people for an answer

IVETTE RIVERA>>55

LESLIE SCOTT>>I am having trouble with my computer

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LESLIE SCOTT>>we will just have to make monday a study day in class!!

MICHAEL JENSEN>>my computer is not working at all, can i just study on my own now

IVETTE RIVERA>>My screen keeps freezing also!

TED GOERTZEL>>Please do not answer unless you are called on, the system can't handle it

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RICHARD STRONSKI>>every one calm down for christ sake and listen to the professor

TED GOERTZEL>>Terri Ann Sauter, well us,Which depends on common sense: face validity, convergent validity, construct validity

COLLEEN MCCAUSLAND>>lol

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SHAREDA COLEMAN>>lol

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TERRI ANN--SAUTTER>>face?

TED GOERTZEL>>That's right, Terri

SHAREDA COLEMAN>>yeah

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TED GOERTZEL>>Shareda, don't sign on with "yeah" - too many people clogs the system

TED GOERTZEL>>Here is a question for Karla Blevins

BRIDGETTE WILSON>>I don't like this method of reviewing I am not getting anything out of it.

SHAREDA COLEMAN>>oops

CORRINE MARTIN>>bc there are too many peopel talking at once

TED GOERTZEL>>The statemen t"there is a lot of crime here because a lot of people break the law" is which: a hypothesis, a theory, a tautology, a finding or a statistic

SHAREDA COLEMAN>>tautology

TED GOERTZEL>>this question is for casey

IVETTE RIVERA>>AGREE!!!!

TED GOERTZEL>>Shareda and Ivette, don't answer unless you are called on

SHAREDA COLEMAN>>i'm leaving this is not working for me

TED GOERTZEL>>Berna, can you explain the difference between reliability and validity?

TED GOERTZEL>>Robert Coyle and Stephen Aiell can also answer

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TED GOERTZEL>>Let me make it multiple choice: which tellus us whether a measure measures what is it supposed to measure? Reliability or validity?

CASEY STRONSKI>>tautology

TED GOERTZEL>>Tautology was right for the crime question

HEIDI BAITINGER>>validity

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TED GOERTZEL>>Here is a question for Brian Wasilewski: ARe social science findings Provable or Falsifiable?

RICHARD STRONSKI>>Go bRian!

TED GOERTZEL>>Are you there, Brian?

BRIAN WASILEWSKI>>is it provable?

TED GOERTZEL>>No, actually, falsifiable - we can disprove statements, but we can't ever be absolutely certin they are true

BRIAN WASILEWSKI>>ok i understand

TED GOERTZEL>>Who can tell me what a SLOPS is?

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COLLEEN MCCAUSLAND>>i can

TED GOERTZEL>>I took a chance here leaving it open, but I'm not b eing overwhelmed with answers

TED GOERTZEL>>tell us colleen

VINCENT CONSTANTINE>>selfselected listener opion polls

COLLEEN MCCAUSLAND>>self selected listener opinion polls

COLLEEN MCCAUSLAND>>yo i think he said colleen

TED GOERTZEL>>This is a question for anyone whose first name is from A to F

TED GOERTZEL>>Which measure dispersion: the mean the median or the standard deviation?

VINCENT CONSTANTINE>>you are too slow colleen

CASEY STRONSKI>>standard deviation

BERNA BAEZ>>reliability is a consistent variable or reliable and validity lacks credibility though it is reliable too.

COLLEEN MCCAUSLAND>>oh am i

TED GOERTZEL>>that's right, standard deviation measures dispersion

ISABEL LOPEZ>>now now children

RICHARD STRONSKI>>jerry springer style in the chatroom

COLLEEN MCCAUSLAND>>its gonna be if he says in slow one more time

TED GOERTZEL>>What kind of data is required for a regression analysis: nominal, ordinal or interval?

BRIDGETTE WILSON>>Can we stay on topic?

COLLEEN MCCAUSLAND>>yeah that would be nice

TED GOERTZEL>>Anyone whose first name is from g to m

LILIANA FUENTES>>interval?

HEIDI BAITINGER>>interval

TED GOERTZEL>>Interval is correct

IVETTE RIVERA>>INTERVAL

TED GOERTZEL>>Here is a true/false question, for those with first names from N to z

TED GOERTZEL>>The larger the population, the larger the sample we need to study it. True or false?

TIMOTHY BEAL>>F

YAIZA CRUZ>>false

VINCENT CONSTANTINE>>false

NICOLE CHRISTISON>>false

BRIAN WASILEWSKI>>false

ROBYN DUFRAIN>>false

TED GOERTZEL>>yes, it is false

SHAREDA COLEMAN>>false

RICHARD STRONSKI>>what is false

TED GOERTZEL>>I was asked to do a Standard Deviation question, let me do it step by step

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TED GOERTZEL>>The instructions are as follows 1.   compute the mean for the distribution (add up all the scores and divide the total by N, the number of cases).

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TED GOERTZEL>>That's just the first step. We'll take three numbers 55, 65 and 85

ISABEL LOPEZ>>68.33

TED GOERTZEL>>They add up to 150.55, dividing by 3 gives us a mean of 50.2

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IVETTE RIVERA>> 68.33

VINCENT CONSTANTINE>>wrong

CASEY STRONSKI>>let ted do it

TED GOERTZEL>>No, mine is obvioiusly wrong, Ivette must be right It adds to 205, 68.33 is right

KAREN GARCIA>>68.33

BERNA BAEZ>>68.33

TED GOERTZEL>>Now we subtract that from each of the values 55-68.83 = 13.33

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TED GOERTZEL>>65 - 68.33 = -3.33

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HEIDI BAITINGER>>85-68.33=16.67

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TED GOERTZEL>>Now we square the differences

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TED GOERTZEL>>-3.33 squared is 11.11

TED GOERTZEL>>13.33 squared is 177.69

NICOLE CHRISTISON>>-13.33= 177.69

NICOLE CHRISTISON>>16.67 = 277.89

TED GOERTZEL>>16.67 squared is 277.89

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TED GOERTZEL>>Now we all all three squares up 277.89 + 11.111 + 177.69 = 466.69

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TED GOERTZEL>>Now we divide that by n-1, which is 2.   466.69/2 = 233.35

ISABEL LOPEZ>>17.017

ISABEL LOPEZ>>17.107

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TED GOERTZEL>>The last step is to take the square root of 233.35 which is 15.3

TED GOERTZEL>>17.017 doesn't seem to be right

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TED GOERTZEL>>Which is higher, the mean income in the United States or the median income in the United States?

TED GOERTZEL>>Anyone?

RICHARD STRONSKI>>the median

LESLIE SCOTT>>median

YAIZA CRUZ>>the median?

TIMOTHY BEAL>>mean

DANIEL POWELL>>mean

ALEXIS HEWES-EDDINGER>>mean

TED GOERTZEL>>Timothy and Daniel are right, the mean is higher

TED GOERTZEL>>Whi did you think so, Timothy or Daniel?

NICOLE CHRISTISON>>177.68+11.09+277.89

TIMOTHY BEAL>>its all instincts my friend

DANIEL POWELL>>highrer incomes will raise the average

KAREN GARCIA>>mean

TED GOERTZEL>>The reason is that there are more extremely high incomes than extremely low ones

DANIEL POWELL>>the median is just the middle income

TED GOERTZEL>>no one makes MINUS a million dollars a year

TED GOERTZEL>>We are reaching the end of the hour, so I'm going to try opening it up to general questions

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TIMOTHY BEAL>>im leaving its going to overload

HEIDI BAITINGER>>Will the test consist of MC and formula questions?

NICOLE CHRISTISON>>Can you give us the answer to the SD

RICHARD STRONSKI>>Prof. remember im coming to your office to take the exam at 1:30 today

FRANCESCA CRINITI>>you said you are going to give us formulas right?

TED GOERTZEL>>The test will be multiple choice and formula questions.

VINCENT CONSTANTINE>>15.27

RICHARD STRONSKI>>dont stand me up

TED GOERTZEL>>The answer I got for the SD question was 15.27

TED GOERTZEL>>I will have a sheet of formulas for the test, but if I forget remind me to put it up on the screen

TED GOERTZEL>>The transcript of this session will be on our course home page in a few minutes

FRANCESCA CRINITI>>thanks thats great!

HEIDI BAITINGER>>Approx how many MC questions

KAREN GARCIA>>is this an open book test?

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TED GOERTZEL>>I have 57 questions now, but why do people want to know that?

TIMOTHY BEAL>>good class professor

ISABEL LOPEZ>>i dont think we should try this again, it really wasn't helpful

RICHARD STRONSKI>>yeah how many M.C. questions

TED GOERTZEL>>What do people think about having class this way?

BRIDGETTE WILSON>>I agree with Isabel

LESLIE SCOTT>>it was quite confusing at first

FRANCESCA CRINITI>>class is a different story but a review, no

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HEIDI BAITINGER>>It was useful beacuse no one was talking over the prof in the back of the classroom

BERNAI BROWN>> it doesn't help at all, the class isn't mature enough for this!!

LESLIE SCOTT>>that is true

RICHARD STRONSKI>>yea this was great

YAIZA CRUZ>> it was ok .. people just need to focus!

KAREN GARCIA>>If we do this again, I think we should be called on

BRIDGETTE WILSON>>We need to have an in class review because it would be more beneficial and a better use of our class time

HEIDI BAITINGER>>I agree

TIMOTHY BEAL>>i think its ok, because same thing wouldve happened in classroom, ppl yelling over each other what is this what is that, just be civilized and your ok

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VINCENT CONSTANTINE>>I think we should get extra credit for doing this

TED GOERTZEL>>OK, we'll talk kabut this in class

BERNA BAEZ>>i don't like it, i couldn't keep up with the paste

LESLIE SCOTT>>but everybody is here

KARLA BLEVINS>>it was easier once everyone stopped typing at once

TED GOERTZEL>>It isn't extra credit, it is our regular class hour

CASEY STRONSKI>>yeah 5 points extra credit

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KAREN GARCIA>>In addition I think people should be more considerate and act like they are college students and not in kindergarten

RICHARD STRONSKI>>yea that paste was everywhere

VINCENT CONSTANTINE>>D'oh

TED GOERTZEL>>The discussion list on WEBCT will be open all weekend, post additional questions there

ISABEL LOPEZ>>yes but not everyone logged in

LILIANA FUENTES>>could you post the remainder of the questions you were going to ask us?

CASEY STRONSKI>>bye!!!!

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TED GOERTZEL>>Let's close class now, but people can remain after if they have more questions.

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RICHARD STRONSKI>>Everybody stay and chill

TED GOERTZEL>>All questions will be on the transcirpt

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RICHARD STRONSKI>>the after party

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NICOLE CHRISTISON>>bye

LESLIE SCOTT>>I had many questions about definitions some are very very close in meaning

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ISABEL LOPEZ>>see ya monday for out test!!!

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TED GOERTZEL>>Leslie, you have to pay attention to the precise wording sometimes. If specific ones bother you, post a question to the discussion list

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TED GOERTZEL>>a lot of peole are still "logged on" but no one is sending any messages

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BRIDGETTE WILSON>>Can we have a regular review in class for the second exam?

RICHARD STRONSKI>>how much is each question worth

LESLIE SCOTT>>i didnt do well on the definitions for sampling. I dont know if it was the way they were worded in the sample quiz

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TED GOERTZEL>>If you are ready to leave, hit the "quite" button

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TED GOERTZEL>>We could have a regular review and also an online review. I tried doing a regular review on Wednesday, but we got bogged down on levels of measurement

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LESLIE SCOTT>>what chapters is the test going to be on

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BRIDGETTE WILSON>>Signing off

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TED GOERTZEL>>The test will cover chapters one to four, this information is int he class notes

LESLIE SCOTT>>thanks

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TED GOERTZEL>>OK, I am signing off. See you on Monday

LESLIE SCOTT>>see ya

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BERNA BAEZ>>Thanks,