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Statistics over four consecutive years showed that four percent

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Statistics over four consecutive years showed that four percent [#permalink]

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New post 08 Dec 2017, 03:14
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Statistics over four consecutive years showed that four percent more automobile accidents happened in California during the week following the switch to daylight saving time and during the week following the switch back to standard time than occurred the week before each event. These statistics show that these time changes adversely affect the alertness of California divers.

The conclusion in the argument above is based on which of the following assumptions?

(A) Drivers in California as well as those in the rest of the United States have similar driving patterns.
(B) The observed increases in accident rates are due almost entirely to an increase in the number of minor accidents.
(C) Four years is not a sufficiently long period of time over which to judge the phenomenon described.
(D) There are no other factors such as school vacations or holiday celebration that cause accident rates to rise during these weeks.
(E) A time change at any other time of years would not produce a similar increase in accident rates.
[Reveal] Spoiler: OA
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Re: Statistics over four consecutive years showed that four percent [#permalink]

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New post 08 Dec 2017, 04:03
Clearly D. D eliminates the odds of other factors causing the issue, confirming that the culprit of accidents is changed time schedule.
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Re: Statistics over four consecutive years showed that four percent [#permalink]

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New post 09 Dec 2017, 10:32
I chose D because it made sense that external factors besides time changes can cause accidents. However, answer E confuses me because if we negate it and say that time changes at other times of the year produce similar increases in accidents, wouldn't that imply that the times referenced in the prompt are not unique? i.e, the prompt says that 'THESE TIME CHANGES' (daylight savings) affect alertness. However, if we negate answer E, i see it as time changes besides daylight savings, produce similar amounts of accidents. Why does E not poke a hole in the argument by saying all time changes have an effect, not just "THESE TIME CHANGES"?
Re: Statistics over four consecutive years showed that four percent   [#permalink] 09 Dec 2017, 10:32
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Statistics over four consecutive years showed that four percent

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