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A person is considered obese if her BMI i.e. Body Mass Index, a ratio

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A person is considered obese if her BMI i.e. Body Mass Index, a ratio  [#permalink]

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New post 11 Jul 2018, 12:00
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A person is considered obese if her BMI i.e. Body Mass Index, a ratio of a person’s weight to square of her height, exceeds a certain number. In 1990, the average BMI of the population was just below the threshold level for obesity. However, in a recent survey conducted, it was found that the average weight was 10% more than that of the population in 1990. Given that there has not been any increase in average height of the population since 1990, the obesity levels in the country must have increased.

Which of the following, if true, would cast the strongest doubt on the conclusion drawn above?

(A) In another survey conducted, it was found that the average fat consumption by individuals in the country has decreased.
(B) All the participants in the survey were taller than an average citizen of the country
(C) The population of country has increased by more than 10% since 1990.
(D) Obese people have a shorter life span than other people.
(E) A major criterion for selecting participants in the survey was the willingness of the participants to actively participate in the survey.
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Re: A person is considered obese if her BMI i.e. Body Mass Index, a ratio  [#permalink]

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New post 11 Jul 2018, 12:13
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I feel the answer should be D since it shows that we are talking about the percentage here and not actual numbers and increase in the BMI does not necessarily mean that the entire Current population has undergone the survey for us to reach the conclusion

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Re: A person is considered obese if her BMI i.e. Body Mass Index, a ratio  [#permalink]

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New post 11 Jul 2018, 18:07
Since the conclusion is merely drawn based on the survey, B is correct.
That the participants are taller than average casts the doubt on the assumption that "there has not been any increase in average height"
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A person is considered obese if her BMI i.e. Body Mass Index, a ratio  [#permalink]

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New post 11 Jul 2018, 22:20
Probus wrote:
A person is considered obese if her BMI i.e. Body Mass Index, a ratio of a person’s weight to square of her height, exceeds a certain number. In 1990, the average BMI of the population was just below the threshold level for obesity. However, in a recent survey conducted, it was found that the average weight was 10% more than that of the population in 1990. Given that there has not been any increase in average height of the population since 1990, the obesity levels in the country must have increased.

Which of the following, if true, would cast the strongest doubt on the conclusion drawn above?

(A) In another survey conducted, it was found that the average fat consumption by individuals in the country has decreased.
(B) All the participants in the survey were taller than an average citizen of the country
(C) The population of country has increased by more than 10% since 1990.
(D) Obese people have a shorter life span than other people.
(E) A major criterion for selecting participants in the survey was the willingness of the participants to actively participate in the survey.


The argument talks about the BMI - a value which is the ratio of weight and the height
- of a person. When the BMI exceeds a number, he/she is considered obese. Now, the
average BMI of a population is in question. In 1990, this value was below the threshold
but recently the average weight of the population surveyed was 10% more. Since the
average height has not increased beyond a point, the argument concludes that the
obesity levels must have also increased.

Option B(All the participants in the survey were taller than an average citizen of the
country)
weakens the argument, as it quashes the claim that the obesity level would
have definitely increased because if the height increases for a subsequent increase
in weight the BMI would remain constant thereby keeping the obesity level constant.
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Re: A person is considered obese if her BMI i.e. Body Mass Index, a ratio  [#permalink]

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New post 11 Jul 2018, 22:57
OA:B

Major flaw in conclusion that it is based on taking in account the weight of people in the survey, but for height, average height of general population is taken into consideration. for survey to be valid , height and weight of same person need to be used for calcultaing BMI. Option B highlights this flaw
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Re: A person is considered obese if her BMI i.e. Body Mass Index, a ratio &nbs [#permalink] 11 Jul 2018, 22:57
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