Using the data listed in Question 15,

In Q 15

Time 1 ______________ Time 2

4 .............................8

3 .............................2

5 .............................7

4 .............................6

6 .............................3

(a) Compute the mean difference (MD), standard deviation (sD), and standard error for the difference scores (sMD).

(b) Sketch a graph of the distribution of mean difference scores (MD ± sD).

(c) Sketch a graph of the sampling distribution of mean difference scores (MD ± sMD).