Mathematics
Mathematics, 17.10.2019 04:00, Jenifermorales101

Amedical 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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