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2) You now need to construct confidence intervals for the mean monthly sales in this recent...

2) You now need to construct confidence intervals for the mean monthly sales in this recent month for this type of shirt for the population of stores in the chain. You select a random sample of 65 stores that are members of the population you are studying. You find that the mean sales of the product in these stores for the month that is being studied are 417.6 shirts. You believe that the population standard deviation of the number of units sold is 75 units. Construct both 95% and 98% confidence intervals for the mean monthly sales per store of the shirt. Be sure to explain the meaning of these intervals. Comment upon the effect of the change in confidence level on the widths of your intervals.

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