A researcher would like to evaluate the effectiveness of a treatment program designed to reduce aggressiveness in domestic violence offenders. Prior to participating in the program, each of n = 8 participants has their aggressiveness rated on a scale from 1 to 10 by a clinical psychologist. After participating in the program, a second aggressiveness rating is recorded. The data are below. Using this information answer the questions below.   Before After     6 2       8 3     9 4     8 1

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  1. A researcher would like to evaluate the effectiveness of a treatment program designed to reduce aggressiveness in domestic violence offenders. Prior to participating in the program, each of n = 8 participants has their aggressiveness rated on a scale from 1 to 10 by a clinical psychologist. After participating in the program, a second aggressiveness rating is recorded. The data are below. Using this information answer the questions below.

 

Before

After

 

 

6

2

 

 

 

8

3

   

9

4

 

 

8

1

 

 

10

2

 

 

5

3

 

 

9

8

 

 

7

7

 

 

 

 

Compute the mean for the sample of difference scores (MD).

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Step 1

Given

sample size (n)  = 8

 

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