Question

An educational psychologist studies the effect of frequent testing on retention of course material. In one of the professor's sections, students are given quizzes each week. The second section receives only two tests during the semester. At the end of the semester, both sections receive the same final exam, and the scores are summarized below.

Frequent quizzes: n= 15, M= 72, SS= 100
Two exams: n=15, M=68, SS=110

Do the data indicate that testing frequency had a significant effect on performance? Use a two-tailed test at the 0.01 level of significance.
1. What is t?
2. What is the critical value?
3. Do you reject the null hypothesis?
4. What is r2?
5. What size is the effect (small, medium or large)?

Answer 1

Solution:-

Given infirmation is,

An educational psychologist studies the effect of frequent testing on retention of course material. In one of the professor's sections, students are given quizzes each week. The second section receives only two tests during the semester. At the end of the semester, both sections receive the same final exam, and the scores.

Excel(PH Stat) output:

The Value of the test statistics is t=4.0042.

The Critical values are -2.7633,2.7633.

Conclusion:

Since t(=4.0042)>2.7633,then reject null hypothesis.

Therefore,the testing frequency has a significant effect on perfprmance.

value is ,

The Effect is Small.