OG [10th] 3

[whoopsnow]

OG-CR 3

The average life expectancy for the United States population as a whole is 73.9 years, but children born in Hawaii will live an average of 77 years, and those born in Louisiana, 71.7 years. If a newly wed couple from Louisiana were to begin their family in Hawaii, therefore, their children would be expected to live longer than would be the case if the family remained in Hawaii.

Which of the following statements, if true, would most significantly strengthen the conclusion drawn in the passage?

A. As population density increases in Hawaii, life expectancy figures for that state are likely to be revised downward.
B. Environmental factors tending to favor longevity are abundant in Hawaii and less numerous in Louisiana.
C. Twenty-five percent of all Louisianans who move to Hawaii live longer than 77 years.
D. Over the last decade, average life expectancy has risen at a higher rate for Louisianans than for Hawaiians.
E. Studies show that the average life expectancy for Hawaiians who move permanently to Louisiana is roughly equal to that of Hawaiians who remain in Hawaii.

Answer is :B

關於這題以及整個CR的做法 我的想法如下
無論是weaken/strengthen/asumption...
首先必須剔除的 必定是"無關"的選項
"無關"這個概念真的很重要
就以這題來說
題目；全美平均壽命73,路州71, 夏州77
若路州夫婦移居夏州 則路州夫婦小孩的預期壽命可增長..... 求strengthen

A--夏州人口增多則平均年齡將減少---> 與該路州夫婦的小孩無關 不選
B--夏州讓人長壽的環境因素比路州多---> 正確答案, 路州夫婦的小孩在夏州成長, 托夏州環境良好之福, 自然更為長壽
C--路州移居夏州者,有25%壽命超過77歲---> 與題目所問無關. 別人的壽命長短跟題目所問的路州夫婦一點關係也沒有!!
D--過去十年內路州人平均壽命增加的速度比夏州人快---> 與題目所問無關. 平均壽命增加或減少, 跟題目所問的夫婦沒有關係....... 整體平均值的增加或減少, 無法推論到個別樣本
E--夏州移居路州者的平均壽命不變---> 無關該路州夫婦

[fiona]

謝謝whoopsnow大的分享
我還以為你又開始唸AT了說@@