Question: A manufacturing company is trying to determine the average assembly time for one of their products. A random sample of 36 employees is selected and their average time is 26.9 minutes. Assume ? = 3 minutes.

A. Construct a 95% confidence interval and explain what the interval means in terms of assembly time.

B. What does the 5% mean?

C. How is the confidence interval affected if a 90% level of confidence is used instead?