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举例说明什么是整群抽样?

答案

参考答案:

它是将总体划分为若干子群体,然后以子群体作为抽样的单位,采用随机的方法从中抽取若干子群体,将抽出的子群体中所有个体合起来作为总体样本的方法。例如,要在一个有100所中学的城市中抽取1/20学生(假设各中学学生人数相同)作为样本,进行体育达标情况调查。若采用整群抽样的方法,就是从全市100所中学中按上述三种抽样方法之一抽取5所中学,被抽到5所中学学生合到一起构成了调查的样本。

阅读理解

阅读理解

     Much as Robby tried, he lacked the sense of tone and basic rhythm (节奏). But he dutifully

reviewed his lessons. Over the months he tried and tried, and often repeated to me "My mom's

going to hear me play some day."

    But he seemed hopeless, with no born ability. A real bad advertisement for my teaching! I was

so happy when one day he stopped coming.

    Several weeks later my students were to have a recital (演奏会). To my surprise, Robby came,

asking to play in the recital.

     "But, it is for current pupils; you dropped."

     "My mom was sick. But I have been practicing. I've just got to play!"

    I didn't know what led me to agree, maybe...

    The recital came. I__put__Robby__up__last__to__play__before__my__"curtain__closer", by

which, I could save the recital if...

    The recital went on well.  Robby came up on stage, clothes wrinkled and his hair looked like

he'd run an eggbeater through it. "How could his mom...?"

     Robby pulled out the piano bench and began. It was Mozart's work! I was not prepared for

what I heard next. Like in a dream, I was then woken up by the wild applause-everybody was on

their feet!

     "I've never heard you play like that, Robby! How'd you do it?"

    Through the microphone Robby explained: "Well, Miss Hondorf, remember I told you my mom

was sick? Actually she had cancer and died this morning. She was born deaf, and tonight was the

first time she ever heard me play. I wanted to make it special."

     My eyes were wet. He was not a student of mine, but a teacher!

1. We can infer from the underlined sentence that the writer ________.

A. was fully confident that Robby would perform well in the recital

B. thought that Robby would make the recital special

C. thought that Robby wouldn't play in the recital

D. had no confidence in Robby at all in the recital

2. What made the boy succeed in the recital?

A. Love for his mother.    

B. Musical talent.

C. The writer's help.      

D. Regular practice.

3. What made the writer think that Robby was her teacher, not a student?

A. That he played better than her in the recital.

B. That he loved his mother more than she did.

C. That he never gave up.

D. That the audience gave him more applause than her.

4. What is the highlight of the recital?

A  The writer's performance.

B. Robby's performance.

C. Robby and his mom's story.

D. The audience's applause.

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