Consider data on sales before and after a particular

    1. Consider data on sales before and after a particular advertising campaign in 10 states.StatesPrePost19.5210.2829.6310.4537.718.5147.838.6258.9710.0368.629.45710.119.6889.969.6298.511.84109.6211.95(a) At the .05 level of significance, is there reason to believe that there is a difference between in sales?(b) Construct a 99% confidence interval for the difference in mean between Pre and Post.

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