oretta, who turns  91  this year, has heard that the mean systolic blood pressure among the elderly is  120  millimeters of mercury ( mm Hg ), but she believes that the actual value is higher. She bases her belief on a recently reported study of  19  randomly selected, elderly adults. The sample mean systolic blood pressure of the adults in the study was  130   mm Hg , and the sample standard deviation was  20   mm Hg . Assume that the population of systolic blood pressures of elderly adults is normally distributed. Based on the study, at the  0.05  level of significance, can it be concluded that  μ , the mean systolic blood pressure among elderly adults, is greater than  120   mm Hg ?

MATLAB: An Introduction with Applications
6th Edition
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Author:Amos Gilat
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Loretta, who turns 

91

 this year, has heard that the mean systolic blood pressure among the elderly is 

120

 millimeters of mercury (

mm Hg

), but she believes that the actual value is higher. She bases her belief on a recently reported study of 

19

 randomly selected, elderly adults. The sample mean systolic blood pressure of the adults in the study was 

130

 

mm Hg

, and the sample standard deviation was 

20

 

mm Hg

.

Assume that the population of systolic blood pressures of elderly adults is normally distributed. Based on the study, at the 

0.05

 level of significance, can it be concluded that 

μ

, the mean systolic blood pressure among elderly adults, is greater than 

120

 

mm Hg

?

 

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