Calculate the contrasts W0 and W1
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pretest, then participates in six sessions using the tutor, then is given a parallel posttest. The data are as follows:
|
Subj.
|
pre
|
post
|
|
1
|
10
|
13
|
|
2
|
11
|
6
|
|
3
|
9
|
18
|
|
4
|
13
|
17
|
|
5
|
8
|
14
|
|
6
|
7
|
11
|
|
7
|
4
|
8
|
|
8
|
13
|
18
|
|
9
|
10
|
12
|
|
10
|
17
|
20
|
|
11
|
5
|
9
|
|
12
|
9
|
16
|
|
13
|
12
|
12
|
|
14
|
7
|
13
|
Compute the contrasts W0 and W1 using COMPUTE statements. Write these syntax commands yourself or use the menu system then PASTE them into the syntax window.