我
。
，试问能否认为该天生产的钢板质量方差满足要求?
}.
且X与Y相互独立，则
。
及
分别为原假设与备择假设，则P{拒绝
为真}=________。
，则D(2X-Y+1)= 。
=________。
，且
，则C=________。
，其中
未知，
为样本，(n>2)，未知参数
的置信度为95%，则其置信水平a=______.- A.E(2X-1)=2np
- B.D(2X+1)=4nP(1-p)+1
- C.E(2X+1)=4np(1-p)+1
- D.D(2X-1)=4nP(1-p)
()- A.0.25
- B.0
- C.0.5
- D.1
- 18
-
- A.<img src="//img1.yqda.net/question-name/60/dc477986c639d687ddeef2206b8f03.png" width="81" height="70"/>
- B.<img src="//img1.yqda.net/question-name/e0/9dcaccdffa729d5f8a4927bd45fca0.png" width="79" height="71"/>
- C.<img src="//img1.yqda.net/question-name/b8/f9ba5f4fa91ffc44b1a197d055574a.png" width="117" height="69"/>
- D.<img src="//img1.yqda.net/question-name/46/464df6b03588f80e3727c10b17b691.png" width="119" height="68"/>
- A.a=1/4
- B.P{X=2}=1/2
- C.P{X<2}=1/4
- D.P{X<4}=1/2
- 20
-
- A.1/2
- B.1/3
- C.1/6
- D.1
- A.<img src="//img1.yqda.net/question-name/05/6f5e87f137a804555677a203c72991.png" width="224" height="55"/>
- B.<img src="//img1.yqda.net/question-name/12/71663c62e1e046779325d1ddee80b3.png" width="212" height="78"/>
- C.<img src="//img1.yqda.net/question-name/d0/1314def466f7af7224b67dce6cfe86.png" width="244" height="82"/>
- D.<img src="//img1.yqda.net/question-name/0c/9d839d6e93901ef0b40c461e4c6885.png" width="224" height="79"/>
- 22
-
- A.<img src="//img1.yqda.net/question-name/04/0a5308f6e53c246a451c68a2b1320f.png" width="156" height="76"/>最小
- B.<img src="//img1.yqda.net/question-name/15/280c9eeb9bbee911c802e770278fad.png" width="143" height="85"/>最小
- C.<img src="//img1.yqda.net/question-name/8b/6cf4e116bafeab80f0267930d3f0f0.png" width="181" height="82"/>最小
- D.<img src="//img1.yqda.net/question-name/6c/4196cd1c1adfa7920d00aaac122ac2.png" width="188" height="76"/>最小
为待检假设，犯第一类错误的是()- A.<center></center><img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />成立，经检验接受<img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />
- B.<img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />成立，经检验拒绝<img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />
- C.<img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />不成立，经检验接受<img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />
- D.<img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />不成立，经检验拒绝<img src="//img1.yqda.net/question-name/ec/fdae718d3cf6c1b73e302da720c541.png" width="40" height="29" />
- A.AB
- B.<img src="//img1.yqda.net/question-name/c0/612e106caf7bde41e116cf249d66b9.png" width="30" height="21"/>
- C.<img src="//img1.yqda.net/question-name/56/e0e5091a5a84e9890ae0153ce1e9be.png" width="27" height="19" />
- D.AUB
则当0- A. <img src="//img1.yqda.net/question-name/0a/a949f47f512bb99d8cae7cdb71e1f0.png" width="41" height="43"/>
- B.x
- C.2x
- D.4X
