Finding of a survey of Systems magazine subscribers: Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine: Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

For both of the findings to be accurate, which of the following must be true?


More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.

Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.

Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.

Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.

Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine.

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考题讲解

情景：对System杂志订阅客户的调查：在由于广告而下的订单中，30%的订单是35岁以下杂志订阅客户。
对在System杂志上投放广告的客户的调查：在由于广告而下的订单中，大多数的订单是35岁以下人。

推理：本题问的是must be true，所以是演绎推理。

选题方式：破题的关键是：两个调查的对象不同，第一个是对买了广告上的东西的订阅者的调查，第二个是对所有买了广告上的东西的人的调查。要知道，并不是所有买了东西的人都是订阅者。

选项分析：

A选项：更多的从来没有买过广告上的产品的System杂志的订阅者是35岁或者超过35岁的。推理文段中所有的数据都是买过产品的人的数据，至于没买过东西的人是什么年龄构成，我们无从得知。

B选项：在System杂志的订阅者中，低于35岁的比例去年比今年低。推理文段中没有提及两个年份的订阅者的情况。

C选项：大多数因看广告而下订单的人是来自35岁以上的杂志订阅者的。本选项有一定迷惑性。实际上，我们可以说，在订阅者这个群体里，因看广告而下订单的人是35岁以上的占大多数。但是，购买广告上的产品的人不一定都是订阅者，非订阅者也可以购买。

D选项：去年，35岁以下的订阅者在买广告上的产品方面花的钱比35岁以上的人少。推理文段只谈了订单数，而没谈花费。

E选项：Correct. 去年，很多由于看广告而买东西的人不是杂志的订阅者。 看广告买东西的杂志用户30%是35岁以下，然而对于全体看广告而买东西的人来说，大部分35岁以下的。显然地，很多买了东西的人并非杂志订阅者。

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Prep2007E1-CR
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