逻辑大全-17-16，大家没发现有问题吗？

wudiyeah

16. The proportion of women among students enrolled in higher education programs hasincreased over the past decades. This is partly shown by the fact that in 1959,only 11 percent of the women between twenty and twenty-one were enrolled incollege, while in 1981, 30 percent of the women between twenty and twenty-onewere enrolled in college.
Toevaluate the argument above, it would be most useful to compare 1959 and 1981with regard to which of the following characteristics?

(A) The percentage of women betweentwenty and twenty-one who were not enrolled in college
(B) The percentage of women betweentwenty and twenty-five who graduated from college
(C) The percentage of women who, afterattending college, entered highly paid professions
(D) The percentage of men between twentyand twenty-one who were enrolled in college
(E) The percentage of men who graduatedfrom high school


答案为D，可是我想了一个下午也觉得不对呢。。首先 AGE 20~21这个年龄段的男女比例又没给，不知道其绝对数的变化，光知道比例的变化，怎么推得出来Proportion increasing啊！

Gail小M

答案肯定是没问题的。ABCE都是无关选项。可是我也觉得20-21women绝对数没给的确会对原文推理造成问题但我想也许原文的出题思路是这样的：
the line of reasoning ：the fact that the  proportion of women enrolled among 20-21year old females is increased is in order to demonstrate that there more woman in the college. Thus the proportion of woman/all students is increased.

D: if the proportion of 20-21 men enroll in the college among 21-21 year old males is also increased. thus it can attack the original reasoning. cause the fact that more women in the college does not mean increased proportion, the number of males is also increasing in the same time.

考点: the increasd number is not equal to increased proportion. U have to get the comparison results beween males and females.
我是这么想的。不然如果考虑20-21 females 的总的基数和20-21male的总的基数的数，原文给的比例就完全没用的。

gaohp80

请问:
only 11 percent of the women between twenty and twenty-one were enrolled incollege, 这里的11%是指入学的20-21的women 占总的20-21women的百分比吗?
如果是这样的话,有D不一定能得出结论阿!! 最有意义的是知道20-21的入学男女总数阿, 我觉得D只是most useful 的答案!

sdcar2010

1959     1981
M(total)     m       a*m
W(total)    w       b*w

M(college) mc     c*mc
W(college) wc     d*wc

note: M and W, either total or collage, are between twentyand twenty-one.

The question asks us to evaluate the ration of [wc/(mc + wc)] to [(d*wc)/(c*mc + d*wc)] or the ratio of c/d


The stimulus says that 1) wc/w = 0.11; (d*wc)/(b*w) = 0.3.  Basically, d/b = 0.3/.11

Similarly, answer choice D can give us the value of c/a.  But since we do not know the ratio between a and b, we could never know the ration between c/d.  So D alone is not sufficient.