Homework 1234567891011

timer Asked: May 7th, 2015

Question description

A psychologist is studying the self-image of smokers, which she measures by the selfimage (SI) score from a personality inventory.  She would like to estimate the mean SI score µ for the population of all smokers.  She plans to take a random sample of SI scores for smokers and estimate µ via this sample.  Assuming that the standard deviation of SI scores of the population of all smokers is 85, what is the minimum sample size needed for the psychologist to be 99% confident that her estimate is within 15 of µ?

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