25 A psychologist would like to examine the effects of diffe

25. A psychologist would like to examine the effects of different testing methods on the final performance of college students. One group gets regular quizzes, one group gets three large exams, and the third group only gets a final exam. At the end of the course, the psychologist interviews each student to get a measure of the student’s overall knowledge of the material.

Please show manual calculations

a. Do these data indicate any significant differences among the three methods? Test with á = .05.

b. Compute Tukey’s HSD to determine exactly which methods are significantly different.

Quizzes

Exams

Final Only

8

5

3

3

4

2

5

4

2

7

2

2

Solution