四格表χ2检验，可用于（）
A.两均数差别的假设检验
B.两中位数比较的假设检验
C.两样本率比较的假设检验
D.样本率与总体率比较的假设检验
E.样本均数与总体均数比较的假设检验
参考答案：C
解析：
四格表χ2检验，可用于两样本率比较的假设检验，答案C正确。四格表用于计数资料，答案A和E用于计量资料；四格表χ2检验须用实际频数，而总体率无实际频数；两中位数比较一般采用秩和检验。
| 阅读理解。 |
| Want to be an astronaut? Then "study hard, stay healthy and have perseverance (毅力). This is what Chinese astronaut Fei Junlong and Nie Haisheng said in a talk with some students. Students were interested in the astronauts' space lives. They asked questions like "Did you see the Great Wall from space?" Fei and Nie said they didn't see the Great Wall. But they felt excited when they passed over China, including Taiwan, the island "looked very beautiful, like a jade (翡翠). Speaking of their lives beyond the earth, the two astronauts said cooperation (合作) with each other was most important, "we are like the left and right hands," they said. Young people wanted to know how the astronauts developed their careers. "How did you decide to be astronauts when China's space industry is still beginning?" asked a young woman. The astronauts said it was because of their love of flight and also the need of the country. They said their love of flight could be seen from their children's names. Nie's daughter is called "Nie Tianxiang" which means "flying up high". Fei's son is called "Fei Di", which sounds like "feidie", meaning UFO. After the success of Shenzhou VI, China plans to put a man on the moon and build a space station in 10-15 years. |
| 1. If you want to be an astronaut, what should you do from now on? |
[ ] |
| A. We should be interested in the astronauts'space life. B. We should change our names. C. We should study hard, stay healthy and have perseverance. D. We should love the flight and our country |
| 2. When astronauts work in space, they must ________with each other. |
[ ] |
| A.shake hands B.cooperate C.stay D.talk |
| 3. In 10-15 years, China could put a man on _______ and build a space station. |
[ ] |
| A.UFO B.Shenzhou VIII C.the sun D.the moon |
| 4. Which of the following is true? |
[ ] |
| A. FeiJunlong met UFO in space B. Nie Haisheng saw the Great Wall from space. C. Fei and Nie make a contribution to China's space industry. D. The astronauts couldn't see Taiwan from space. |
| 5. Nie and Fei want to be astronauts because of ____________ |
[ ] |
| A.their love of flight B.the need of the country C.their daughters D.both A and B |
