Chapter+12+JMP+Assignment+1

Chapter+12+JMP+Assignment+1 - Inthisassignment,.1(p.234)and...

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Chapter 12 JMP Assignment 1 In this assignment, you are going to analyze the data found in Table 12.1 (p. 234) and  recreate the various statistics found on pages 236-243.  We are then going to do the  analysis again using completely nonsensical numbers to represent the two groups. 1. Go to our site on Sakai and open the folder labeled Chapter 12.  Click on the file  called “Data from Table 12-1.jmp” to open the data table in JMP.  You will see that  the data table has two columns, MOVS and GROUP.  You can also see that these  data are the same as Table 12.1, except the  N  = 49 scores are in two columns  instead of four.   2. The first thing you need to do is to take a look at the univariate statistics for MOVS.  Click on  Analyze  and then on  Distribution .  Select MOVS as the  Y, Columns  variable.  When you click  OK , you will see the same set of distribution statistics you  have generated several times before.  This time, however, these statistics are not  particularly useful.  For example, the mean is 6.22, but this is the so-called “grand  mean” for both the Normal and the Disordered groups combined.  Go ahead and  play around a bit.  Obtain some  More Moments  and use the value of the variance  to calculate the SS for MOVS.  Does this correspond to the book?   3. Click on  Analyze  and  Distribution  again and put MOVS in the  Y, Columns  box.  This time, however, put GROUP in the  By  box.  This  By  concept is very useful  because it tells JMP to calculate the distribution statistics for each value of the  By  variable.  Because GROUP only has two values (1, 0), will get two separate  distributions.  Click  OK .   4. Assuming you haven’t messed around with any of the default preferences in JMP,  you will most likely have to two distributions arrayed in a long narrow strip.  They  are very hard to compare in this format.  To change this, click on the  Red  Diamond  by “Distributions GROUP = 0” and select  Stack .  See the way they line  up for easy comparison.  Also notice that we can now take a first look at the means  of the two groups separately.  
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5. At one level this is easy.  The GROUP = 0 has a mean of 5.68, and the GROUP = 1  has a mean of 6.79.  There obviously is a difference and we will test that in a  minute.  First, let’s put this difference back into the context of our study.  Take a  look at Table 12.1 in the book (p. 234).  Notice that the Normal children were  GROUP = 1, and the Disordered children were GROUP = 0.  As a result, we can 
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