A small company that specializes in gourmet cookies decides to redesign its packaging. The company owner is certain that the new package will lead to increased sales. Weekly sales at a random sample of stores in the Barrie area are recorded before and after the change in package design. Using the 5% level of significance, analyze the data to see if the owner's idea is correct. Also, construct a 90% confidence interval estimate of the differences in sales after the product redesign. The data set is available in MyStatLab and is reproduced in Exhibit 9.15.
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