One Mean Est Tech: Problem 7 Previous Problem Problem ListNext Problem (1 point)

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One Mean Est Tech: Problem 7 Previous Problem Problem ListNext Problem (1 point) A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 21 minutes. How large a sample should she take to estimate the mean time to within 5 minutes with 99% confidence? Sample Size Preview My Answers Submit Answers You have attempted this problem 0 times You have unlimited attempts remaining

Explanation / Answer

Solution:- Given that sd = 21 , E = 5 , Z = 2.58

Formula :   Sample size n = (Z*sd/E)^2

n = (2.58*21/5)^2

= 117.4188

= 117

Sample size = 117

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