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In 1985 a consumer agency concluded that Xylo brand bicycles

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In 1985 a consumer agency concluded that Xylo brand bicycles [#permalink] New post 20 Feb 2019, 05:32
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27% (02:11) correct 72% (00:50) wrong based on 11 sessions
In 1985 a consumer agency concluded that Xylo brand bicycles are safer to ride than are Zenon brand bicycles. The agency based the conclusion on the ratio of the number of rider injuries to the number of riding hours for each brand of bicycle from 1981 through 1984. Yet for identically designed bicycles manufactured since 1985, the number of rider injuries has been twice as great among riders of Xylos as among riders of Zenons. Therefore, the agency's conclusion would have been different for the period since 1985.

Which of the following is an assumption that, if true, supports the claim that the agency's conclusion would have been different for the period since 1985?

A. For the period since 1985, the number of riding hours for Zenons totaled at least half the number of riding hours for Xylos.
B. Of all the bicycles ridden in the period since 1985, the percentage of Xylos ridden was twice the percentage of Zenons ridden.
C. Prior to 1985, Zenon owners were more likely than Xylo owners to report the injuries they sustained while riding their bicycles.
D. In 1985 the agency had miscalculated the ratio for Xylos, for Zenons, or for both.
E. Soon after the agency had issued its report, consumer demand for Xylos increased more rapidly than did consumer demand for Zenons.
[Reveal] Spoiler: OA

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Re: In 1985 a consumer agency concluded that Xylo brand bicycles [#permalink] New post 01 Mar 2019, 15:21
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Note that the argument only discusses the number of injuries since 1985, not accounting for changes in riding hours. We can bet, then, that the right answer will have something to do with riding hours.

And indeed, choice E fits very well. It tells us that the amount of riding hours of Xylos was not double the riding hours of Zenons. Since the amount of rider injuries is double, this means that the ratio of rider injuries to riding hours is greater for Xylos than for Zenons, contradicting the conclusions of the consumer agency.
Re: In 1985 a consumer agency concluded that Xylo brand bicycles   [#permalink] 01 Mar 2019, 15:21
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In 1985 a consumer agency concluded that Xylo brand bicycles

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