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    Hey!

    I have a statistic question I want some help with (like which formulas to use etc.). Here it comes:

    1. 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 20 minutes. How large a sample should she take to estimate the mean time to within 1 minutes with 90% confidence?
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    (Original post by SikoSiko)
    Hey!

    I have a statistic question I want some help with (like which formulas to use etc.). Here it comes:

    1. 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 20 minutes. How large a sample should she take to estimate the mean time to within 1 minutes with 90% confidence?
    within 1 minute above or below the true mean

    σ / √n * φ-1(0.95) = 1

    sub in and rearrange
 
 
 
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Updated: November 4, 2015
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