Question #178772

Among 157 African-American men, the mean systolic blood pressure was 146 mm Hg with a standard deviation of 27. We wish to know if on the basis of these data, we may conclude that the mean systolic blood pressure for a population of African-American is 140.

Expert's answer

n=157 , sample mean=146, s=27, α=0.01

We reject H_{0} if Z>Z_{1-α} = Z_{0.99}= 2.33

Hence, we can conclude that the mean systolic blood pressure for a population of African-American is greater than 140 mm Hg.

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