Payment Time Case Study Major consulting firms such as Accenture, Ernst amp;amp; Young Consulting, and Deloitte amp;amp; Touche Consulting employ...

Can you make a  100    word    report   and answer the following question using the data.  NOTE I WILL NOT USE YOUR WORK AS MINE. I WILL USE IT AS STUDY GUIDE.

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