Re: [問題] OG-CR81
※ 引述《lovekyoko (今年在芝加哥跨年 )》之銘言：
: 81. 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?
: (A) Drivers who equip their vehicles with radar detectors are less likely to
: be ticketed for exceeding the speed limit than are drivers who do not.
: (B)Drivers who are ticketed for exceeding the speed limit are more likely to
: exceed the speed limit regularly than are drivers who are not ticketed.
: 答案是B 但我對題目有一點模糊
: 題目說 在M高速公路3%的駕駛人裝有雷達 接著說33 percent of all vehicles
: 這是指在3%有雷達被開單的33%嗎??? 換句話說有雷達車的有67%沒有被開單
: 可以解釋一下A和B嗎 我大腦打結了
我也對assumption的部份有點感冒
有人提出 把選項取非 則題目不成立
這題是說3%的人有裝雷達偵測器
但超速被開單的人裡面33%有裝雷達偵測器
所以很顯然有裝的人更容易超速
A說有裝偵測器的人比較不可能被開超速罰單 (變成weaken了)
B說收到罰單的人本來就是比較容易超速的人
(若取非 則變成這群被開單的人是不容易超速的 則與題目相反)
這樣理解不知道對不對....前面爬文也有
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12/13 03:18, , 1F
12/13 03:18, 1F
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