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Population variance using between-column variance

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Reference no: EM133036496

A study compared the effects of four 1 month point of purchase promotions on sales. The unit sales for five stores using all four promotions in different months follow. Free Sample 78 87 81 89 85One-pack gift 94 91 87 90 88 Cents off 73 78 69 83 76Refund by mail 79 83 78 69 81

a. Compute the mean unit sales for each promotion and then determine the grand mean

b. Estimate the population variance using between-column variance

c. Estimate the population variance using within-column variance

d. Calculate the F ratio. At the 0.01 level of significance, do the promotions produce different effect on sales

Reference no: EM133036496

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