In order to test the hypotheses:
H0: µ 1 - µ 2 = 0
H1: µ 1 - µ 2 ? 0,
we independently draw a random sample of 18 observations from a normal population with standard deviation of 15, and another random sample of 12 from a second normal population with standard deviation of 25.
a. If we set the level of significance at 5%, determine the power of the test when 1 - 2 = 5.
b. Describe the effect of reducing the level of significance on the power of the test.
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b. As...
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