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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 15 minutes. How large a sample should she take to estimate the mean time to within 3 minutes with 90% confidence?

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MissPhiladelphia

In the analysis of the given options, the most likely answer to this question is that the sample size of the study should be at least 30. This is because to get the approximate effect of the study, a sample of 30 will be reliable. 

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