A company employs two shifts of workers. Each shift produces a type of gasket where the thickness is the critical dimension. The average thickness and the standard deviation of thickness for shift 1, based on a random sample of 30 gaskets, are 10.53 mm and 0.14 mm. The similar figures for shift 2, based on a random sample of 25 gaskets, are 10.55 mm and 0.17 mm. Let μ1 − μ2 be the mean difference in thickness between shifts 1 and 2.

a. Calculate a 95% confidence interval for μ1 − μ2.

b. Based on your answer to part a, are you convinced that the gaskets from shift 2 are, on average, wider than those from shift 1? Why or why not?

Save your time - order a paper!

Get your paper written from scratch within the tight deadline. Our service is a reliable solution to all your troubles. Place an order on any task and we will take care of it. You won’t have to worry about the quality and deadlines

Order Paper Now

c. How would your answers to parts a and b change if the sample sizes were instead 300 and 250?

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"