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A psychologist is studying smokers' self-images, which she measures by the self-image (SI) score from a personality inventory. For adults in the U.S., the mean SI score from this inventory

is about 150.The psychologist gathers a random sample of 12 SI scores of smokers and finds that their mean is 148 and their standard deviation is 34. Assume that the population of SI scores of smokers is normally distributed with mean u. Based on the sample, can the psychologist conclude that u is different from 150? Use the 0.05 level of significance.

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