A sample of 25 concession stand purchases at the May 12 matinee of Spider-Man 3 showed a mean purchase of $ 7.29 with a standard deviation of $ 3.02. For the May 18 evening showing of the same movie, for a sample of 25 purchases the mean was $ 7.12 with a standard deviation of $ 2.14. The means appear to be very close, but not the variances. At @ = .05, is there a difference in variances? Show all the steps clearly, including an illustration of the decision rule.