Sofia nice · 2023年06月05日
NO.PZ2015120604000131
问题如下：
Which of the following descriptions is the least accurate about hypothesis testing?
选项：
A.
A Type II error refers to fail to reject when the null is false.
B.
A one-tailed test with a significance level of 1% has z-critical values of 2.58.
C.
One minus the probability of a Type II error equals the power of test .
解释：
B is correct.
A one-tailed test with a significance level of 1% has z-critical values of 2.33
不懂B，容易搞混。麻烦详细说下。Z统计不都是双尾吗？为啥会有单尾的。另外，为啥用1%折合单尾0.5%，而不是2%
袁园_品职助教 · 2023年06月06日
嗨，从没放弃的小努力你好：
单尾和双尾和分布没有关系的，Z统计也是可以有单尾的，它是根据你的备择假设来的，比如你是检验b1>=0,那么备择假设就是b1<0,这种情况就是单尾检验。再比如下面这个双尾和单尾检验的图。
这里查表，直接找1%就可以了，直接对应2.33
----------------------------------------------努力的时光都是限量版，加油！
Sofia nice · 2023年06月16日
还是没太懂，为啥又是2.33呢？如果说一个单尾Z分布的显著性水平是1%，是不是就是1个尾巴是1%，2个尾巴就是2%
NO.PZ2015120604000131问题如下Whiof the following scriptions is the least accurate about hypothesis testing?A.A Type II error refers to fail to rejewhen the null is false.B.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.58.C.One minus the probability of a Type II error equals the power of test .B is correct.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.332.33不应该是one-tailetest with significant level of 2%吗
NO.PZ2015120604000131问题如下 Whiof the following scriptions is the least accurate about hypothesis testing?A.A Type II error refers to fail to rejewhen the null is false.B.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.58.C.One minus the probability of a Type II error equals the power of test .B is correct.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.33 Type II error=1-power of test，这说的就是c吧，为什么c不对
NO.PZ2015120604000131问题如下Whiof the following scriptions is the least accurate about hypothesis testing?A.A Type II error refers to fail to rejewhen the null is false.B.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.58.C.One minus the probability of a Type II error equals the power of test .B is correct.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.33老师，我是用排除法选的B，看了其他同学的问题和您的回复，99% a是0.01对应双尾是2.58，那单尾就是0.005？这怎么查出来的呢
NO.PZ2015120604000131 问题如下 Whiof the following scriptions is the least accurate about hypothesis testing? A.A Type II error refers to fail to rejewhen the null is false. B.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.58. C.One minus the probability of a Type II error equals the power of test . B is correct.A one-tailetest with a significanlevel of 1% hz-criticvalues of 2.33 POWER OF TEST 就是test 步骤三么 计算公式那步么。怎么理解C
