问题
单项选择题
假设检验时所犯的两类错误的关系是
A．n一定时，α减小则β减小
B．n一定时，α减小则β增大
C．α值改变与β无关
D．检验中犯第一类错误则不会犯第二类错误
E．等于1-β
答案
参考答案：B
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假设检验时所犯的两类错误的关系是
A．n一定时，α减小则β减小
B．n一定时，α减小则β增大
C．α值改变与β无关
D．检验中犯第一类错误则不会犯第二类错误
E．等于1-β
参考答案：B
| 完形填空。 | |||
| Museums are often 1 interesting and beautiful things, but in most museums you can only look at the things there, you can't touch them. This is not very 2 for most of us. People want to touch things. They want to use them and 3 them. That is 4 we learn about things. If we are interested in 5 ,we learn about it 6 . But some museums are quite different. For example, at the Boston 7 Museum in Boston, young people can use computers and other modern machines. They can also move and play games there. 8 this kind of museum. boys and girls feel very happy. They can 9 a lot 10 the same time. | |||
| ( )1. A. full of ( )2. A. interested ( )3. A. play ( )4. A. how ( )5. A. anything ( )6. A. much easily ( )7. A. Child's ( )8. A. In ( )9. A. look at ( )10. A. from | B. full with B. interesting B. play together B. why B. something B. much easier B. Children's B. At B. see B. at | C. filled of C. interest C. play for C. where C. nothing C. more easily C. Childs' C. Into C. watch C. in | D. fill with D. interests D. play with D. when D. all thing D. more easier D. Childrens D. For D. learn D. of |