10.56 A sample of 25 concession stand purchases at the 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 a standard deviation of

$2.14. The means appear to be very close, but not the variances. At α = .05, is there a difference

in variances? Show all steps clearly, including an illustration of the decision rule. (Data are from

a project by statistics students Kim Dyer, Amy Pease, and Lyndsey Smith.)

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 a standard deviation of

$2.14. The means appear to be very close, but not the variances. At α = .05, is there a difference

in variances? Show all steps clearly, including an illustration of the decision rule. (Data are from

a project by statistics students Kim Dyer, Amy Pease, and Lyndsey Smith.)

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