Hypothesis testing for equality of variance.
A sample of 25 concession stand purchases at October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with the 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 steps clearly, including an illustration of decision rule. (Data are from a project by statistics students Kim Dyer, Amy Pease, and Lyndsey Smith.)