问题 单项选择题

随机抽样调查某地15岁以上人口200人,高血压患病率为14.3%;若估计该地15岁以上人口高血压患病率的99%的可信区间,最好选用

A.p±1.96Sp
B.p±t0.05Sx
C.p±2.58Sx
D.p±2.58Sp
E.p±1.96Sx

答案

参考答案:D

解析:[解题思路] 率的可信区间估计方法有查表法和正态近似法;查表法用于样本含量较小(≤50),且样本率≥1%时,当样本含量较大时,样本率p和1-p均不太小,如np和n(1-p)均≥5时,可用正态近似法95%的可信区间为p±1.96SP99%的可信区间为p±2.58Sp

阅读理解

阅读表达

Are some people born clever and others born stupid? Or is intelligence developed by our environment and our experience? Strangely enough, the answers to these questions are both Yes. To some extent, our intelligence is given to us at birth, and no amount of special education can make a genius out of a child born with low intelligence. On the other hand a child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied surroundings. Thus the limits of a person’s intelligence are fixed at birth, but whether or not he reaches those limits will depend on his environment. This view, now held by most experts, now held by most experts, can be supported in a number of ways.

It is easy to show that intelligence is to some extent something we are born with. The closer the blood relationship between two people, the closer they are likely to be in intelligence. Thus if we take two unrelated people at random from the population, it is likely that their degree of intelligence will be completely different. If, on the other hand, we take two identical twins, they will very likely be as intelligent as each other. Relations like brothers and sisters, parents and children, usually have similar intelligence and this clearly suggests that intelligence depends on birth.

Imagine now that we take two identical twins and put them in different environments. We might send one, for example, to a university and the other to a factory where the work is boring. We should soon find differences in intelligence developing and this shows that environment as well as birth plays a part. This conclusion is also suggested by the fact that people who live in close touch with each other, but who are not related at all, are likely to have similar degree of intelligence. (274 words)

56. In the author’s opinion, how is a man’s intelligence given to him? (No more than 15 words)

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57. What does the author mean by saying “if we take two unrelated people from the population”? (No more than 10 words)

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58. What does the example of the twins going to college and to a factory separately reveal? (No more than 10 words)

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59. Please explain the underlined phrase in English. (No more than 5 words)

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60.What have the research results shown?

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单项选择题