At the start of the semester, a sample of statistics students were asked to take a pre-test to determine what they already know about statistics. As the end of the semester, they are asked the same questions as a part of a post-test. Below are the number of incorrect questions on the pre-test and the post-test. Use the repeated measures t-test to determine whether students’ performance improved over the course of the semester.

Student    Pre test   post-test

A                 8                 5

B                10                6

C                 7                  4

D                5                  3

E                  8                 4

F                  9                 6

G                 7                  7

H                 5                  2

I                   6                  4

J                   10                 5

1. State the null and alternate hypotheses in symbols

2. What critical value should be used to test the hypothesis with = .05?

3. Calculate the repeated measures t-statistic.

4. What decision should the researcher make about the null hypothesis?

5. Calculate Cohen\'s d.

6. What conclusion should the researcher reach about the effect of the class on students’ knowledge of statistics?

Answer rating: 100% (QA)

n10 and df 9 Student Pre test Post test Difference D D 2 A 8 5 3 9 B 10 6 4 16 C 7 4 3 9 D 5 3 2 ... View the full answer