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
