问题 问答题 简答题

在体育科学研究中,关于样本含量有哪些特殊的规定?

答案

参考答案:

在体育科学研究中,关于样本含量的特殊规定有:对药品的疗效研究,样本含量应不少于300例;某种方法或手段对人体健康或增强体质的研究,样本含量应不少于100例;对教法、训练法的研究,每组样本量应不少于30例;当研究对象总体不足30例时,样本含量至少应在10例以上;如果样本含量少于10例,则因缺乏统计学意义而被视为该样本不具有代表性。

阅读理解

Hi Hongbo,

I’m so glad to read about the changes talking place in your city. It’s really good news that you can travel by subway in Xi’an, though there’s only one line there. Here in London we have twelve lines. By the way, we don’t use the word “subway” here. It’s American English. We call it “the Underground”, instead.

The London Underground is very famous. It’s famous for several reasons. First of all, part of the underground railway today is the oldest in the world, which opened in 1863. Secondly, the London Underground is also the first line to have electric trains, in 1890. Thirdly but not the last, the London Underground is the second largest metro system in the world, after the Shanghai Metro. There are 270 stations in the Underground and it has 402 kilometres of tracks(轨道). What’s more, the city of London itself helps make the transportation system famous! I’ve got a few photos to help you build a clear picture of the Underground in my city. They are together with this mail.

In your email, you also said workers were building more lines. I’m sure your city is developing fast. Maybe you can send me a few photos of your city today. I really want to see the changes taking place there. I’m happy for you to live there in an ancient city with such a new look!

So much for now. I’ll write soon again. Best wishes!

小题1: Where is the writer from?

A.From Xi’an.

B.From Shanghai

C.From London

D.From New York小题2: The second paragraph mainly tells us        ?

A.when the first subway was opened in the world.

B.when the London Underground first used electric trains

C.why the London Underground is the oldest subway in the world.

D.why the London Underground is famous in the world小题3:In the email, the words “subway”, “underground”, and “metro” mean         .

A.almost the same thing

B.two different things

C.three different things

D.nothing like each other小题4: What does the writer want Hongbo to do?

A.To buy a good book about Xi’an for him.

B.To post him some postcards of Xi’an.

C.To tell him more about Xi’an subway.

D.To send him a few photos of Xi’an.

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