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[LSAT] picked the right answer, not truly understand the question [复制链接]

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发表于 2010-8-29 06:35:34 |显示全部楼层
A certain airport security scanner designed to detect explosive in luggage will alert the scanner's operator whenver the piece of luggage passing under the scanner contains an explosive. The scanner will erroneously alert the operator for only one percent of the pieces of luggage that contain no explosives. Thus in ninety-nine out of a hundred alerts explosives will actually be present.

The reasoning in the argument is flawed because the argument

E. Substitutes one group for a different group in the statement of a percentage.

I did not see the argument is flawed at all.

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Aries白羊座 荣誉版主 律政先锋

发表于 2010-8-29 07:44:06 |显示全部楼层
will erroneously alert the operator for only one percent of the pieces of luggage that contain no explosives.
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有两种行李,一种有炸弹,一种没有炸弹(no  explosives)。
文章没有提到,有炸弹的行李,出错的概率。
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也许,有炸弹的行李,一个都测不出来。
那么,概率就不是 99%。
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发表于 2010-8-29 11:15:18 |显示全部楼层
[LR][PT13-S2-Q24]

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RE: picked the right answer, not truly understand the question [修改]
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picked the right answer, not truly understand the question
https://bbs.gter.net/thread-1146458-1-1.html
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