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Beth's Butter Works has test marketed their new low-fat butter substitute with two different styles of packaging. They are trying to estimate the sales of the product for each type of packaging. Average daily sales of the product in the traditional plastic tub was 100 units across 16 stores, and sales of the product in gold foil wrap had the same average sales of 100 units across a sample of 25 stores. The standard deviation for each of the samples is 20. Management at Beth's would like to know with a 95% confidence. How many units they can expect to sell per store?
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