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

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Statistics

An educational psychologist studies the effect of frequenttesting on retention of class material. In one of the professor'ssections, students are given quizzes each week. The second sectionreceives only two tests during the semester. At the end of thesemester, both sections receive the same final exam, and the scoresare summarized below.

a. Do the data indicate that testing frequency has a significanteffect on performance? Use a two-tailed test with α = .01. (7points)

b. Compute r2 and state the size of the effect (e.g. small,medium, large). (2 points)

Frequent Quizzes n=15,m=72,SS=112

two exams n=15,M=68,SS=98

Answer & Explanation Solved by verified expert
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The Rsquared additionally called the coefficient ofassurance which is the extent of change in the reliantvariable that can be clarified by the    See Answer
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