PLEASE FOLLOW THE INSTRUCTIONS AND DO THE CALCULATIONS IN EXCEL

NO PLAGIARISM

Review the Payment Time Case Study and Data Set.

Develop a 700-word report including the following calculations and using the information to determine whether the new billing system has reduced the mean bill payment time (Please note student options as noted in the announcement posted 7/29/2019 at 12:06 a.m.):

• Assuming the standard deviation of the payment times for all payments is 4.2 days, construct a 95% confidence interval estimate to determine whether the new billing system was effective. State the interpretation of 95% confidence interval and state whether or not the billing system was effective.
• Using the 95% confidence interval, can we be 95% confident that µ ≤ 19.5 days?
• Using the 99% confidence interval, can we be 99% confident that µ ≤ 19.5 days?
• If the population mean payment time is 19.5 days, what is the probability of observing a sample mean payment time of 65 invoices less than or equal to 18.1077 days?

Submit your assignment. Please note student submission options as noted in the announcement posted 7/29/2019 at 12:06 a.m.

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