Question Help * Six different second-year medical students at Bellevue Hospital

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Question Help * Six different second-year medical students at Bellevue Hospital measured the blood pressure of the same person. The systolic readings (in mmHa) are listed below Find the range, variance, and standard deviation for the given sample data. If the subject's blood pressure remains constant and the medical students correctly apply the same measurement technique, what should be the value of the standard deviation? 121 148 135 134 133 139 Range mmHg Time Sample variance-mmlg2 (Round to the nearest tenth as needed.) 110m Sample standard deviationmmg (Round to the nearest tenth as needed What should be the value of the standard deviation? O A. Ideally, the standard deviation would be one because this is the lowest standard deviation that can be achieved. B. Ideally the standard deviation would be zero because all the measurements should be the same O C. Ideally. the standard deviation would be one because all the measurements should be the same. D. There is no way to tell what the standard deviation should be. Click to select your answer(s) Type here to search

Explanation / Answer

Ans:

Range=Maximum-Minimum=148-121=27

Sample variance=386/(6-1)=386/5=77.2

Sample standard deviation=sqrt(77.2)=8.8

Option B is correct(ideally std. dev. should be equal to 0,beacause all measuremets should be same.)

xi (xi-135)^2 1 121 196 2 148 169 3 135 0 4 134 1 5 133 4 6 139 16 sum= 810 386 mean= 135 77.2 variance 8.8 std dev.

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