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An educational psychologist studies the effect of frequent testing on retention of course material. In one...

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 .01 level of significance.

Part 1: What is t?

Part 2: What is the critical value?

Part 3: We would reject H0, and conclude that there is good evidence that that testing frequency had an effect.

Part 4: What is r2?

Part 5: There was a _____ effect.

Math   Statistics-And-Probability   
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