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A recent report determined that although only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors, 33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them. Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.

The conclusion drawn above depends on which of the following assumptions?

正确答案: B

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OG12 CR78不解啊,望高人赐教!

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楼主
发表于 2012-3-2 21:23:50 | 显示全部楼层
这道题我也想了好久,终于想明白了。
关键就是超速不等于开罚单,也许1000人超速,只有100人收到罚单。这样这个假设就不成立。所以我们得限制一个前提就是:收到罚单的人确实比没收到罚单的人易超速,这样就否定了一种可能:没收到罚单的人也超速了。
-- by 会员 sunny20111126 (2012/2/18 12:53:20)



同意楼上,但是这题BACKGROUND 的装电子狗就没有用了么?是迷惑么?????
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