The purpose of the assignment is to develop students’ abilities in using data sets to apply the concepts of sampling distributions and confidence intervals to make management decisions.

I need an explanation for this Statistics question to help me study.

Assignment Steps
Resources: Microsoft Excel®, The Payment Time Case Study, The Payment Time Case Data Set
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:

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 (Excel template with text boxes or Excel template and Word document).

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