Starbucks is launching their new member cards in three different designs for this coming Christmas. A branch manager would like to know whether the average sales of the three cards are the same for 5 consecutive weeks. The accompanying sales records of the three cards for her branch were obtained.

a. Prepare the analysis of variance table for these data.
b. Test the null hypothesis that the population mean that the average sale of the three cards are the same for the five consecutive weeks.
c. Compute the minimum significant difference for the three cards.

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Week 1 23 45 Card 1 22 13 6 21 18 Card 2 14 36 19 5 23 Card 3 13 27 14 30 22