Question: The following MINITAB output presents the results of a hypothesis test for the difference X ?? Y between two population means: a. Is

The following MINITAB output presents the results of a hypothesis test for the difference μ_X?? μ_Ybetween two population means:

Two -sample I for X vs Y SE Mean Mean 3.94 4.43

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

b. What is the null hypothesis?

c. Can H₀ 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 μ_X??? μ_Y based on the z statistic.

Two -sample I for X vs Y SE Mean Mean 3.94 4.43 StDev 2.65 2.38 135 0.23 0.18 Y 180 Difference = mu (X) - mu (Y) Estimate for difference: -0.484442 95% upper bound for difference: -0.007380 T-Test of difference = 0 (vs

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