10.121 Mall Rats One study investigated consumer habits at the mall. We tend to spend the most money shopping on the weekends, and, in particular, on Sundays from 4 to 6 P.M. Wednesday morning shop- pers spend the least!26 Suppose that a random sample of 20 weekend shoppers and a random sample of 20 weekday shoppers were selected, and the amount spent per trip to the mall was recorded.

a. Is it reasonable to assume that the two popula- tion variances are equal? Use the F test to test this hypothesis with a = 0.05.

b. Based on the results of part

a, use the appropriate test to determine whether there is a difference in the average amount spent per trip on weekends versus weekdays. Use a =0.05.

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Weekends Weekdays Sample size 20 20 Sample mean $78 $67 Sample standard deviation $22 $20