A medical center wishes to test the claim that there is a difference between two different over-night| delivery companies with respect to the speed with which they deliver the items. The average speed...

Extracted text: A medical center wishes to test the claim that there is a difference between two different over-night| delivery companies with respect to the speed with which they deliver the items. The average speed of delivery over a 40 day period is shown below: Company A x=14 Company B Xz =16 S = 2.9 SB = 3.1 n = 40 n; = 40 %3D a) Construct a 98% confidence interval for the true mean difference in average delivery times between the two companies. b) Using a = 0.05, is there enough evidence to support the claim that there is a difference between the average delivery times for the two companies? Find the p-value for the test.