K webwork/stat 1220-ecommon /homework9/6 Homework9: Problem 6 Previous Problem L

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K webwork/stat 1220-ecommon /homework9/6 Homework9: Problem 6 Previous Problem List Next (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 16 minutes. How large a sample should she take to estimate the mean time to within 2 minutes with 91 % confidence? Sample Size = Preview My Answers Submit Answers

Explanation / Answer

Solution:- Given that s = 16 E = 2 Z = 1.695

Sample Size  n = [z*s/E]^2

= [1.695*16/2]^2

=183.8736

= 184

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