A psychologist is studying smokers' self-images, which she measures using the self-image (SI) score from a personality inventory. She would mean SI score u for the population of all smokers. Previously published studies have indicated that the mean SI score for the population of all that the standard deviation is 15, but the psychologist has good reason to believe that the value for the mean has decreased. She decides to perform a statistical test and chooses a random sample of 75 smokers' SI scores. She'll use the value 15 for the population star and she'll test at the 0.01 level of significance. Based on this information, answer the questions below, Carry your intermediate computations to four or more decimal places, and round your indicated. (If necessary, consult a list of formulas.) (a) What are the null hypothesis H, and the alternative hypothesis H, that the psychologist should use for the test? 合 Ho: 0 H: 0 On

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