Question: Heritage Software, a maker in educational and business software, operates a service center in Tulsa, Oklahoma, where employees respond to customer calls about questions and problems with the company’s software packages. Recently, a team of Heritage employees was asked to study the average length of time service representatives spend with customers. The team decided that a simple random sample of 25 calls would be collected. The sample mean was 7.088 minutes and the sample standard deviation was 4.64 minutes.

a. Construct a 99% confidence interval estimate.

b. In words, what does this mean? What is the interpretation of your answer?