请指教：大全6-18

gmatmba

The value of a product is determined by the ratio of its quality to its price. The higher the value of a product, the better will be its competitive position. Therefore, either increasing the quality or lowering the price of a given product will increase the likelihood that consumer will select that product rather than a competing one.
Which of the following, if true, would most strengthen the conclusion drawn above?
(A) It is possible to increase both the quality and the price of a product without changing its competitive position.
(B) For certain segments of the population of consumers, higher-priced brands of some product lines are preferred to the lower-priced brands.
(C) Competing products often try to appeal to different segments of the population of consumers.
(D) The competitive position of a product can be affected by such factors as advertising and brand loyalty.
(E) Consumers’ perceptions of the quality of a product are based on the actual quality of the product.
正选为E，为为什么？题目不是说商家致力于提高产品性价比来吸引顾客吗？为什么E能加强？

lindar1009

1，可能有一个反例就是50头犀牛注射的TR数量一致，区别是其中10头collar生育率低，不能归咎于TR。
2，或者50头中的10头collared,且注射的TR多，生育率低，原文结论成立。
以上两者之间是C选项评估的范围。

gmatmba

喔~~明白了，谢谢哈！

shaoyipeng

假如生育率低归罪于T的话，那么跟犀牛有没有collar就没有关系了。我的例子中这种情况因为50只犀牛打的T都一样，那么结论就应该是大家的生育率是一样的低，而不是Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females。因此从这一点证明了Collar的犀牛不是因为打了T而导致比其他没有Collar的犀牛生育率要低。

如果没有回答对你的问题的话我们可以继续讨论。

gmatmba

谢谢~可我还是沉浸在我的思路里出不来了。。你的例子里面10只有collar的是因为重装collar 才打的Tranquilizer~而其他是因为其他原因打的Tr，这2种不都是打的Tr吗？为什么不能把collar的生育率低归罪于那些Tr呢？

shaoyipeng

我觉得lz的方向是对的，不知道为什么还没理出完整的思路来。

假如共有50只犀牛其中10只有collar，到最后统计下来每年每只犀牛被注射的次数都是一样的（那10只有collar的是因为重装collar，而其他的则是因为其他原因被注射），那自然不能把那些collar的生育率低归罪于这些注射液了。

要削弱这个论点：some substance in the tranquilizer inhibits fertility，只要证明题目中的证据（即注射多的犀牛相应生育率低）无效即可。我上面的这个例子就可以让这个证据无效。因此可以削弱。

painsper

(A) It is possible to increase both the quality and the price of a product without changing its competitive position.
这个选项说产品的竞争地位有可能不会变如果同时提升产品的质量和价格，和题目的意思有些接近，但是这只是一个可能性，如果题目是让我们infer的话我想他应该就是正确的了，但是不能加强题目的结论

(B) For certain segments of the population of consumers, higher-priced brands of some product lines are preferred to the lower-priced brands.
这个选项说某个阶层的消费者，更喜欢高价位的某些产品，没有关于性价比的信息，无关选项

(C) Competing products often try to appeal to different segments of the population of consumers.
这个选项说竞争产品经常会去吸引不同的客户群，没有关于相加比的内容，无关

(D) The competitive position of a product can be affected by such factors as advertising and brand loyalty.
说产品的竞争力收广告和品牌影响，文中没有，排除掉

(E) Consumers’ perceptions of the quality of a product are based on the actual quality of the product.
排除了上面四个，只能剩下这个正确了，说消费者的质量观念不是建立在真正的产品质量上的，这样就可以合理推出即时产品质量不好，价格合理的话，消费者也会买，也就是说消费者并不一定就是要买质量好的产品的，质量相对差的也会买，所有可以加强