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# Scientists have studied the effects of electromagnetic fields associat

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Scientists have studied the effects of electromagnetic fields associat  [#permalink]

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13 May 2017, 11:43
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84% (01:13) correct 16% (01:54) wrong based on 75 sessions

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Scientists have studied the effects of electromagnetic fields associated with high voltage power lines upon people whose homes are located within 300 yards of the lines. They have compared the growth rate of children who live near the lines with the growth rate of children who live elsewhere. Because they found no significant differences in the growth rates in the two study areas, they have concluded that electromagnetic fields are harmless.

Which one of the following, if true, would most seriously jeopardize the scientists’ conclusion?

(A) The scientists did not consider other possible impacts upon growth rates.
(B) In studying people who lived near high voltage power lines, the scientists did not consider what type of housing those people lived in.
(C) The growth rates of children have changed considerably since the 1920s.
(D) People who live near electromagnetic fields suffer health problems that are not reflected in the growth rates of their children.
(E) As children get older, their activities tend to occur away from home more often.

Source: Nova GMAT

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Scientists have studied the effects of electromagnetic fields associat  [#permalink]

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13 May 2017, 13:33
After a reading of the argument, author concludes that electromagnetic fields are harmless because they
don't cause any changes in the growth rate of children who live closer to the electromagnetic fields.

The one option which most seriously jeopardize the scientists’ conclusion is Option D
It clearly states that people staying near electromagnetic fields, have other side effects.
Even thought the growth rate of these children is the same as those living away
from the vicinity of the electromagnetic field.
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Re: Scientists have studied the effects of electromagnetic fields associat  [#permalink]

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17 May 2017, 04:33
(A) The scientists did not consider other possible impacts upon growth rates.
(B) In studying people who lived near high voltage power lines, the scientists did not consider what type of housing those people lived in.
(C) The growth rates of children have changed considerably since the 1920s.
(D) People who live near electromagnetic fields suffer health problems that are not reflected in the growth rates of their children.
(E) As children get older, their activities tend to occur away from home more often.
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Re: Scientists have studied the effects of electromagnetic fields associat  [#permalink]

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17 May 2017, 22:30
SajjadAhmad wrote:
Scientists have studied the effects of electromagnetic fields associated with high voltage power lines upon people whose homes are located within 300 yards of the lines. They have compared the growth rate of children who live near the lines with the growth rate of children who live elsewhere. Because they found no significant differences in the growth rates in the two study areas, they have concluded that electromagnetic fields are harmless.

Which one of the following, if true, would most seriously jeopardize the scientists’ conclusion?

(A) The scientists did not consider other possible impacts upon growth rates.
(B) In studying people who lived near high voltage power lines, the scientists did not consider what type of housing those people lived in.
(C) The growth rates of children have changed considerably since the 1920s.
(D) People who live near electromagnetic fields suffer health problems that are not reflected in the growth rates of their children.
(E) As children get older, their activities tend to occur away from home more often.

Source: Nova GMAT

Conclusion : EM fields are harmless.
D is a weakener here ..It conveys that EM is causing health issue among people. so it is harmful.
Re: Scientists have studied the effects of electromagnetic fields associat &nbs [#permalink] 17 May 2017, 22:30
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# Scientists have studied the effects of electromagnetic fields associat

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