Finding value of test statistic using two-tail 'Z' distribution and interpret result.
A researcher is interested in whether social assertiveness might be influenced by training procedures. Two groups of college sophomores are randomly selected. Group A subjects are assigned to the "training sessions" and Group B subjects do not receive the training. Both groups are given the "Social Assertiveness" test (higher scores indicate greater assertiveness). The results are the following:
|
Group A:
|
14
|
11
|
10
|
10
|
8
|
6
|
5
|
9
|
7
|
9
|
10
|
9
|
7
|
8
|
9
|
10
|
11
|
|
Group B:
|
12
|
10
|
10
|
8
|
7
|
6
|
4
|
2
|
5
|
4,
|
6
|
3
|
8
|
6
|
5
|
4
|
|