help in statistics 1

Purpose of Assignment
The purpose of the assignment is to develop students’ abilities in using datasets to apply the concepts of sampling distributions and confidence intervals to make management decisions.
Assignment Steps
Resources: Microsoft Excel®, The Payment Time Case Study, The Payment Time Case Data Set (Please create a text box for each within Microsoft Excel to complete this objective)
Review the Payment Time Case Study and Data Set.
Develop a summary in the text boxes 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?

Click the Assignment Files tab to submit your Microsoft Excel data spreadsheet assignment.

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