1: A sample of 61 observations is selected from one population with a population standard deviation of 0.65. The

sample mean is 2.65. A sample of 48 observations is selected from a second population with a population standard deviation of 0.61. The sample mean is 2.52. Conduct the following test of hypothesis using the 0.01 significance level:

H0: μ1 – μ2 ≤ 0

H1: μ1 – μ2 > 0

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

This is a one-tailed test.