A psychologist studied the effect of frequent testing on perception of course material. In one of the professor's sections, students are given quizzes each week. The secon section receives only two tests during the semester. At the end of the semester, both sections receive the same questionnaire. Summarized below is a random sample of the perception scores from 9 students in each section.
Frequent quizzes: 4,8,3,10,5,6,6,2,10
two exams: 5,7,9,9,10,10,12,14,14
a. Do the data indicate that the testing frequency has a significant effect on performance: Conduct a hypothesis test with a=.05
b. Compute r2 to measure the size of the effect
c. Compute a 90% confidence interval to estimate the population mean difference