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题库 / GMATLA-CR-93
Educational Theorist: Recent editorials have called for limits on the amount of homework assigned to children. They point out that free-time activities play an important role in childhood development and that large amounts of homework reduce children's free time, hindering their development. But the average homework time for a ten year old, for example, is little more than 30 minutes per night. Clearly, therefore, there is no need to impose the limits these editorials are calling for.
Which of the following is an assumption on which the educational theorist's argument relies?
The free-time activities that ten year olds engage in most are all approximately equally effective at fostering development .
Regularly doing homework assignments improves children's academic performance.
Individual teachers are not the best judges of how much homework to assign the children they teach.
In most schools, if not all, the homework assignments given are of a length that does not diverge widely from the average.
Free-time activities rarely teach children skills or information that they can use in their academic work.
选项D，大多数12岁以下，作业时间小于10分钟，不应该是支持educational theorist 的结论吗（不应该限制）？
这个问题其实我没太看明白。选项D的字面意思是：大部分的学校给的家庭作业的时间不是在和平均是背离很大的。说成人话的意思是，不存在这么一种情况，即，某些学校不怎么留作业，某些学校往死里留作业。如果这种情况发生的话，那么提出限制就有意义了，因为可以限制那些留很多作业的学校。反过来说，如果大家留的作业都是30分钟左右的，自然就不用去贯彻这种限制的方针了。所以，选项D加强了结论。
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①看到样本平均数就要产生“有样本分布问题”的想法，如果样本分布不均匀，一大堆2、3小时和一大堆2、3分钟的，虽然平均数也是30min，这样还是需要限制做作业的时间，毕竟2、3小时很多
②In GMAT CRs any quatitative data, especially with adjectives such as \"generally\" , \"on average\" etc are always questionable
mark
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削弱点在于average，题干中说十二岁以下的儿童平均每天只需要做作业半小时左右。D选项说很大一部分的十二岁以下的学龄儿童第一年上学的作业时间低于十分钟，也就是说这些人的学习时间拉低了平均数，实际上有一部分学生用于做作业的时间很多。
是个样本推理，10年级的到各个年级的
C 取反后：老师是作业量最好的裁判。不能削弱结论。
结论：儿童不需要限制作业量