Create a box plot for the variable days

Reference no: EM131167474

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?

Reference no: EM131167474

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