Investigators are studying employees at a bus company to test their hypothesis t

Question

Investigators are studying employees at a bus company to test their hypothesis that occupational stress causes high blood pressure. Two major groups of employees are of interest: bus drivers and office workers in the same salary range. The investigators measure the blood pressure of all bus drivers and of a group of office workers matched to the bus drivers on age, sex, race, and length of employment. The mean blood pressure of the drivers is higher than that of the office workers and the investigators conclude that stress causes high blood pressure. The authors conclusion that stress causes high blood pressure is incorrect because:

a) non of the other answers

b)one study is insufficient to draw conclusion

c)they did not account for the effects of age

d) they did not show that driving a bus was a source of stress

e) b and d

Epidemiology class

Explanation / Answer

Answers are:

one study is insufficient to draw conclusion and

they did not show that driving a bus was a source of stress

Study might have been right if study had shown that driving was more stressfull then office work which could have resulted in high stress among drivers. But study doesnt tell us that.

So, hence the answers

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