255_Ch_9_PracticeProbs_Solns.pdf

# 255_Ch_9_PracticeProbs_Solns.pdf - 255 Chapter 9 Solutions...

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255 Chapter 9 Solutions 9.1 1 . a. Yes. It is an assertion about the value of a parameter. b. No. The sample median is not a parameter. c. No. The sample std. dev. is not a parameter. d. Yes. The assertion is that the standard deviation of population #2 exceeds that of population #1. e. No. ¯ X, ¯ Y are statistics rather than parameters. f. Yes. H is an assertion about the value of a parameter. 2 . a. These hypotheses comply with our rules. b. H a cannot include the equality, so these hypotheses are not in compliance. c. H o should contain the equality claim, whereas H a does here, so these are not legitimate. d. The asserted value of μ 1 - μ 2 in H o should also appear in H a . It does not here, so our conditions are not met. e. Each S 2 is a statistic, so does not belong in a hypothesis. f. We are not allowing both H o and H a to be equality terms. g. These hypotheses comply with our rules. h. These hypotheses comply with our rules. 7 . A type I error here involves saying that the plant is not in compliance when in fact it is. A type II error occurs when we conclude that the plant is in compliance when in fact it isn’t. Reasonable people may

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