Pizza sales. A national food product company believes that it sells more frozen pizza during the winter months than during the summer months. Average weekly sales for a sample of stores in the Baltimore area over a three-year period provided the following data for sales volume (in pounds) during the two seasons.

(a) How much difference is there between the mean amount of this brand of frozen pizza sold (in pounds) between the two seasons? (Assume that this time frame represents typical sales in the Baltimore area.)

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(b) Construct and interpret a 95% confidence interval for the difference between weekly sales during the winter and summer months.

(c) Suggest factors that might have influenced the sales of the frozen pizza during the winter months.

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