问题 单项选择题

以下关于参数估计的说法正确的是()。

A.区间估计优于点估计

B.样本含量越大,参数估计准确的可能性越大

C.样本含量越大,参数估计越精确

D.对于一个参数只能有一个估计值

E.以上均不正确

答案

参考答案:B

阅读理解

U.S. Bottled Water Sales Are Booming Again Despite Opposition

Despite organized anti-bottled-water campaigns across the country and a noisy debate about bottled water’s environmental impact, Americans are buying more bottled water than ever.

Why do so many people seem to think they should have any input on what other American’s choose to buy or do?

If they want to buy bottled water, let them.

If they want to eat fast food, let them.

If they want to smoke pot, let them.

— Barackalypse

People just get tired of paying for others’ bad behavior. If many people eat excessive fast food, you pay higher insurance premiums. If many people frequently buy bottled water, your trash bills go up and landfills fill up quickly.

It’s about personal responsibility, which really should be a cornerstone of libertarianism.

— Bdbr

So? This is the price you pay to live in a free society. You want to control the life of another just so you can save a few bucks? What would you say when someone do the same to you?

— Norman619

Defend selfish pricks all you like; I’m just glad there are still people who still believe personal responsibility is a good and decent thing. We make your life cheaper and less bothersome.

— Yoyo

What a waste of money! It’s fine when you’re on the road and you need a cold drink, but people who buy cases of bottled water for home are completely crazy.

— Agmlauncher

I wish we all can find a way to improve things and benefit from this. The environment needs a lot of help but businesses will always work on what people would need and demand. Is this part of the balance? Hope we can find better ways.

— Skipweis

小题1:What can we know about bottled water in America?

A.Americans are consuming more bottled water than tap.

B.US bottled water sales have increased for the first time.

C.Activists in several regions have been fighting against it.

D.Some people worry about its bad effect on the environment.小题2:Who would agree with Barackalypse on this matter?

A.Bdbr.

B.Norman619.

C.Yoyo.

D.Agmlauncher.小题3:According to the text, Agmlauncher is _____ bottled water.

A.partly supportive of

B.extremely against

C.strongly in favor of

D.not concerned about小题4:Which of the following statements goes with Skipweis’ opinion?

A.The environment is emphasized too much.

B.It’s impossible for people to find a better way.

C.Business is not totally responsible for the problem.

D.At present we can’t benefit from bottled water at all.

单项选择题 B1型题