SOLUTION: Six different second-year medical students at Bellevue Hospital measured the blood pressure of the same person. The systolic readings (in mmHg) are listed below. Find the range, va

Question 973709: Six different second-year medical students at Bellevue Hospital measured the blood pressure of the same person. The systolic readings (in mmHg) 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?
147 134 121 131 125 137
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
range is 26 (147-121)
variance is 70.58
standard deviation is 8.40
As a retired physician, I have a problem with the second part of this question. The value of the SD should be zero in a perfect world, because they are all measuring the same thing properly and there will be no change. In a real world, the ability to hear the blood pressure sounds and to note it is a very different situation altogether. "correctly apply the same measurement technique" does not deal with that issue. It is possible to correctly do it and get different results from somebody who correctly does it, even assuming constant blood pressure. If done perfectly, there should be no variability and therefore the sd should be zero.
RELATED QUESTIONS
Six different second-year medical students at Bellevue Hospital measured the blood (answered by ewatrrr)

Ok this is the question as it is written, I have worked on it so long and messed it up so (answered by richard1234)

. A medical researcher wishes to try three different techniques to lower blood pressure... (answered by stanbon)

A person's systolic blood pressure, which is measured in millimeters of mercury (mm Hg),... (answered by Boreal)

A person's systolic blood pressure, which is measured in millimeters of mercury (mm Hg),... (answered by ikleyn)

An experiment was set up to find a relationship between weight and systolic blood... (answered by htmentor)

The blood pressure of a person changes throughout the day. Suppose the systolic blood... (answered by ewatrrr)

Please Help. Show work Thanks in advance. A person's systolic blood pressure, which... (answered by rothauserc,macston)

Could someone explain how I should answer these? For questions 1-3, write the null and (answered by Boreal)