An article predicted d\'re consequences resulting from a nationwide buildup of N

Question

An article predicted d're consequences resulting from a nationwide buildup of National Geographic magazines. The author's predictions are based on the observation that the number of subscriptions for National Geographic is on the rise and that no one ever throws away a copy of National Geographic. A key to the analysis presented in the article is the weight of an issue of the magazine. Suppose that you were assigned the task of estimating the average weight of an issue of National Geographic. How many issues should you sample to estimate the average weight to within 0.2 oz with 95% confidence? Assume that sigma is known to be 1.1 oz. (Give the answer to the next largest integer.) _____ You may need to use the appropriate table in Appendix A to answer this question.

Explanation / Answer

here for 95% Ci, z=1.96

std devaiation =1.1

and margin of error E =0.2

hence sample size =(Z*std deviation/E)2 ~117

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