The following MINITAB output presents the results of a hypothesis test for the difference µx - µy between two population means:

a. Is this a one-tailed or two-tailed test?

b. What is the null hypothesis?

c. CanH0 be rejected at the 5% level? How can you tell?

d. The output presents a Student's t test. Compute the P-value using a z test. Are the two results similar?

e. Use the output and an appropriate table to compute a 99% confidence interval for µx - µy based on the z statistic.

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