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A recent state survey of human resources found that the age

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A recent state survey of human resources found that the age [#permalink] New post 16 Feb 2019, 09:37
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A recent state survey of human resources found that the age to which secretarial school graduates are expected to live is four years in excess of the age to which other graduates of high school are expected to live. One possible conclusion is that secretarial school. attendance is beneficial to one's health.

To evaluate the conclusion above, it would be most important to know the answer to which of the following questions?

(A) Have the average age of new high school graduates and the average age of new secretarial school graduates recently increased?
(B) Do some secretarial school graduates have college degrees?
(C) Given that women have a greater life expectancy than men, what are the relative proportions of men and women among high school and secretarial school graduates?
(D) Given that women have a greater life expectancy than men, what proportion of all women attend secretarial school?
(E) Has the proportion of high school graduates who attend secretarial school increased in recent years?
[Reveal] Spoiler: OA

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Re: A recent state survey of human resources found that the age [#permalink] New post 22 Feb 2019, 22:10
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This "possible conclusion" is suspect at best. I assume that those who attend secretarial school are a different population than those who attend other high schools. Let's look at the choices.

(A) The conclusion is about overall life expectancy, not life expectancy after graduation. So we don't care how old students are when they graduate, only how old they live to be.

(B) Since a college degree does not affect life expectancy, we don't care about whether or not anyone has one.

(C) Gender does affect life expectancy. If all the secretarial school graduates are women and all the other high school graduates are men, then that would explain the discrepancy in life expectancy without having to say that secretarial school is good for your health. These proportions are thus relevant to know.

(D) We would have to make too many additional assumptions to make this choice relevant. More importantly, we would also need to know the proportion of men who attend secretarial school.

(E) Graduating from high school has no affect on life expectancy, so this doesn't provide us any relevant information.
Re: A recent state survey of human resources found that the age   [#permalink] 22 Feb 2019, 22:10
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A recent state survey of human resources found that the age

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