Xr13-80 A statistics professor hypothesized that not only would the means vary but also so would the variances if the business statistics course was taught in two different ways but had the same final exam. He organized an experiment wherein one section of the course was taught using detailed PowerPoint slides whereas the other required students to read the book and answer questions in class discussions. A sample of the marks was recorded and listed next. Can we infer that the variances of the marks differ between the two sections?

Class 1 64 85 80 64 48 62 75 77 50 81 90 Class 2 73 78 66 69 79 81 74 59 83 79 84 The following exercises require the use of a computer and software.
The answers may be calculated manually. See Appendix A for the sample statistics.