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Hypothesis Testing of Variances: Concession Stand Purchases

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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 .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.

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The solution provides a step by step method for the calculation of testing of hypothesis. Formula for the calculation and Interpretations of the results are also included. An interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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