Your textbook author Donnelly wants to investigate if having

Your textbook author Donnelly wants to investigate if having students work in groups reduces
the grade variability when compared with a more traditional lecture format. So in 10am class, he
relies primarily on lectures, whereas in 11am class, the students spend more time solving
problems in groups. He collected the following data after the first exam.
10 am class
86 83 86 89 89
85 96 99 75 79
11 am class
90 76 73 90 88
89 84 82 78 86
a. Using a = 0.01, determine if the 11am class experienced less variability in its exam
scores than the 10am class did.
b. Verify your results using excel
c. Interpret the p-value.

Solution