求助大全-Ⅰ-18

晓桐190 · 发表于 2010-12-19 10:17:15

Critics of sales seminars run by outside consultants point out that since 1987, revenues of vacuum cleaner companies whose employees attended consultant-led seminars were lower than revenues of vacuum cleaner companies whose employees did not attend such seminars. The critics charge that for vacuum cleaner companies, the sales seminars are ill conceived and a waste of money.
Which of the following, if true, is the most effective challenge to the critics of sales seminars?
(A) Those vacuum cleaner companies whose sales were highest prior to 1987 are the only companies that did not send employees to the seminars.
(B) Vacuum cleaner companies that have sent employees to sales seminars since 1987 experienced a greater drop in sales than they had prior to 1987.
(C) The cost of vacuum cleaner sales seminars run by outside consultants has risen dramatically since 1987.
(D) The poor design of vacuum cleaner sales seminars is not the only reason for their ineffectiveness.
(E) Since 1987, sales of vacuum cleaners have risen twenty percent.

这道题琢磨了半天也没弄明白为什么要选A撒~~~我选的是C，虽然自己也觉得C好像不太对，但是也对A表示不理解~~~求NN解答~~~

sdcar2010 · 发表于 2010-12-19 10:35:29

A is the weakener. Because this is an unfair comparison if the only company did not send people to the seminar is the best performing company. We need to compare apples to apples, i.e., two companies that are comparable in ALL categorie to start with, in order to have a fair comparision of the effects of the seminar.

For example, maybe if those companies did not send employees to the seminar, their sales would drop even further. Drop less is still a benefit!

晓桐190 · 发表于 2010-12-19 11:34:12

THX~~~大致了解了~~~

求助大全-Ⅰ-18

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求助大全-Ⅰ-18