求manhattan上非主要题型 解释漏洞的一道题 解释

jiaying52

In a recent poll, 71% of respondents reported that they cast votes in the
most recent national election. Voting records show, however, that only 6
of eligible voters actually voted in that election.
Which of the following pieces of evidence, if true, would provide the bes
explanation for the discrepancy?

(A) The margin of error for the survey was plus or minus five percentage
points.
(B) Fifteen percent of the survey's respondents were living overseas at the
time of the election.
(C) Prior research has shown that people who actually do vote are also more
likely to respond to polls than those who do not vote.
(D) Some people who intend to vote are prevented from doing so by last-
minute conflicts on election day or other complications.
(E) Polls about voting behavior typically have margins of error within plus or
minus three percentage points.

manhattan cr p167 答案选C 不理解，觉得D都比C好，另外求C选项翻译。
谢谢！

kikisunflower

poll显示数据：71%投票

实际数据：6%投票

解释数据差别的原因。

C：研究显示，实际参与投票的人比不投票的人更愿意参加poll的调查。如1000的整体，实际60人投票，但发了1000张问卷，返回80份，有56份都说他们投票了，56/80=70%，poll的数据显示70%的人投票。但实际上还有920张没有回收的问卷，而其中有916个人都是没投票的，而这916人懒得投票也懒得做问卷。

D：文中调查数据和实际数据都是投票后的，而D讲的是人们投票前的行为，无法解释投票后数据不一致的原因。

PS: 解释调查数据<>实际数据的题目，可考虑：
  1、样本容量太小（可导致样本不具代表性）
  2、样本不具代表性
  3、抽样方法错误（可导致样本不具代表性）
  4、被调查者故意隐瞒真实答案
  5、问卷设置不准确，导致回答不准确

C指出样本没有代表整体，从而导致调查数据与实际不一致，正确