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For multiple sclerosis patients we wish to estimate the mean age at which the disease was first diagnosed. We want to be 95% confident that

For multiple sclerosis patients we wish to estimate the mean age at which the disease was first diagnosed. We want to be 95% confident that the point estimate is within 5 years of the true mean. If the population variance is 120, how large should our sample be?

(A) 18 (B) 25 (C) 19 (D) 30 (E) 2213

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