(Answered) Question find a 95 confidence interval for the mean number

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Question: Find a 95% confidence interval for the mean number of days it takes Rebco's customers (as a combined group) to pay their bills. Do the same for each customer size separately. Create a box plot for the variable Days, based on all 91 billings. Also, create side-by-side box plots for Days for the three separate customer sizes. Do any of these suggest problems with the validity of the confidence intervals?

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