T Tests-
1. Calculate a t-test for the following:
|
Pre-test scores
|
Post-test scores
|
|
10
|
50
|
|
10
|
60
|
|
20
|
70
|
|
20
|
70
|
|
30
|
80
|
|
10
|
60
|
|
40
|
90
|
|
40
|
90
|
|
50
|
100
|
|
10
|
60
|
|
20
|
70
|
|
40
|
100
|
|
30
|
80
|
|
20
|
70
|
|
30
|
90
|
2. You are interested in investigating the change in students' communication competency scores from your pretest to your posttest. Write the hypothesized relationship:
a. Null Hypothesis:
b. Alternative Hypothesis:
3. Was this a one tail or two tail significance tests? Explain.
4. To what extent are the pre and post test means scores statistically significant?