Three classes in elementary statistics are taught by three different persons, a regular faculty member, a graduate

Question:

Three classes in elementary statistics are taught by three different persons, a regular faculty member, a graduate teaching assistant, and an adjunct from outside the university. At the end of the semester, each student is given a standardized test. Five students are randomly picked from each of these classes, and their scores are as shown in Table 14.4.2.
Test for equality of variances. State any assumptions you have made, and interpret your result.
Table 14.4.2 Exam Scores