求助OG12 CR95

mia113 · 发表于 2011-7-25 10:02:02

求助 OG12 CR95
95. Although parapsychology is often considered a pseudoscience, it is in fact a genuine scientific enterprise, for it
uses scientific methods such as controlled experiments and statistical tests of clearly stated hypotheses to
examine the questions it raises.
The conclusion above is properly drawn if which of the following is assumed?
(C) Any enterprise that does not use controlled experiments and statistical tests is not genuine science.
(D) Any field of study that employs scientific methods is a genuine scientific enterprise.
答案是D, 当时通过取非得出的答案·
排除C 是因为觉得不用CE和ST 不是真科学不能推出用了CE和ST 就是真科学就排除了（感觉这个逻辑思维好像有点问题不知道对不对）
后来对C取非后是：企业不用CE和ST是真科学好像有点消弱了原文· 因为原文是因为用了scientific methods(比方说CE和ET，所以它是真科学
不知道C到底是错在哪了，求助··

evelyn205205 · 发表于 2011-7-25 10:37:54

(C) Any enterprise that does not use controlled experiments and statistical tests is not genuine science.
不用CE和ST 不是真科学。这样的表达不是太绝对了嘛。
虽然原文说用科学方法的研究就是真科学，那就照原文推哦。把这个结论当做原命题，原命题正确，只能推出起逆否命题正确，无法推出其否命题正确。
原命题的否命题的正确与否和原命题的逆命题一致。希望能帮到你~

sdcar2010 · 发表于 2011-7-25 11:44:04

If you negate C), you have:
Any enterprise that does not use controlled experiments and statistical tests IS genuine science.

If so, the main conclusion still holds since C) only extends the coverage of genuine science to include more enterprises. It does not limit the choice of genuine science to exclude pseudoscience.

mia113 · 发表于 2011-7-25 21:21:37

谢谢二楼··还想再请问下关于原命题否命题逆命题逆否命题
记得高中数学学的跟你说的一样：
原命题，逆否命题真假一致（即原命题真逆否命题真原假逆否假）
否命题与逆命题一致
但用在实际中好像就有点把握不好了，
以本题为例：
如果原命题真：用科学方法是真科学逆否命题：假科学是不用科学方法
否命题：用科学方法不是真科学（还是不用科学方法是假科学）逆命题：真科学是用科学方法
说我了之后我自己都已经完全晕了··不知道你能明白我的意思不··如果有问题的话麻烦你纠正我下吖·谢谢了····

sdcar2010 · 发表于 2011-7-25 21:33:42

You got them all right, except the following:

否命题：不用科学方法不是真科学

mia113 · 发表于 2011-7-25 21:34:41

Thank you very much Sdcar
你的意思是说就算没用CE和ST 也是science. 其实是增加了science包括的范围。不会消弱用了科学方法（其中包括ce和st）是真科学这个main conclusion 么？

sdcar2010 · 发表于 2011-7-25 21:35:19

Another thing is: think in English and write in English. Translation between Chinese and English is a waste of time, especially when sitting for the GMAT real test.

sdcar2010 · 发表于 2011-7-25 21:35:47

Thank you very much Sdcar
你的意思是说就算没用CE和ST 也是science. 其实是增加了science包括的范围。不会消弱用了科学方法（其中包括ce和st）是真科学这个main conclusion 么？

-- by 会员 mia113 (2011/7/25 21:34:41)

Exactly.

mia113 · 发表于 2011-7-25 21:50:34

Another thing is: think in English and write in English. Translation between Chinese and English is a waste of time, especially when sitting for the GMAT real test.

-- by 会员 sdcar2010 (2011/7/25 21:35:19)

Got it``I will adopt your suggestion.
However, I still have some doubts after reading some articles about the 真命题否命题。
I deem that 否命题 is 不用真科学方法是假科学 which is almost the same as your answer.

AlohaDJ · 发表于 2011-8-4 22:49:20

NN, could you plz help clarify whether negation must be needed here?

You ever mentioned that the word IF is used in Sufficient assumption prompts rather than in Necessary assumption ones. So here is a sufficient assumption question. For Sufficient assumption quetions, is Negation necessary in general?

Thks a lot for your COOL explanations!

求助OG12 CR95

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