Question 909650: A study looking at symptoms and care-seeking behavior in African-American patients with chest pain, measured the systolic blood pressure of 157 African-American men seen in an emergency department. The mean systolic blood pressure was 146 mm Hg with a standard deviation of 27. The researchers wish to know if on the basis of these data, they can conclude that the mean systolic blood pressure is greater than 140. The test statistic is
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A study looking at symptoms and care-seeking behavior in African-American patients with chest pain, measured the systolic blood pressure of 157 African-American men seen in an emergency department. The mean systolic blood pressure was 146 mm Hg with a standard deviation of 27. The researchers wish to know if on the basis of these data, they can conclude that the mean systolic blood pressure is greater than 140. The test statistic is
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x-bar = 146
Test stat:: z(146) = (146-140)/(27/sqrt(157)) = 2.7844
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Cheers,
Stan H.
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