老师，所查的Z表是品职网页上提供下载的那张Z表吗？

NO.PZ2020010304000048

问题如下：

Using the Excel function NORM.S.DIST or a normal prob-ability table, what are the critical values when testing the null hypothesis, $H_0: \mu = \mu_0$ , against

a. a one-sided lower alternative using a size of 10%?

b. a one-sided upper alternative using a size of 20%?

c. a two-sided alternative using a size of 2%?

d. a two-sided alternative using a size of .1%?

解释：

a. The lower-tailed critical value is -1.28.

b. The one-sided upper-critical value is 0.84.

c. A two-sided alternative with a size of 2% uses the same critical value as a one-sided upper test, which is 2.32. Each tail has probability 1% when using the critical value.

d. This size corresponds to the same critical value as a .05% upper-tailed test, which is 3.29.

比如d问题，查99.95%对应的分位点，表里面3.27对应的是0.9995，可是为什么答案选3.29呢？

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1 个答案

品职答疑小助手雍 · 2021年08月01日

嗨，努力学习的PZer你好：

只是误差问题吧，考试不会非选择题，不用担心因为这种误差出现的选不出答案的问题。

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虽然现在很辛苦，但努力过的感觉真的很好，加油！

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NO.PZ2020010304000048 问题如下 Using the Excel function NORM.S.ST or a normprob-ability table, whare the criticvalues when testing the null hypothesis, H0:μ=μ0H_0: \mu = \mu_0H0:μ=μ0, against a one-silower alternative using a size of 10%? a one-siupper alternative using a size of 20%? a two-sialternative using a size of 2%? a two-sialternative using a size of .1%? The lower-tailecriticvalue is -1.28. The one-siupper-criticvalue is 0.84. A two-sialternative with a size of 2% uses the same criticvalue a one-siupper test, whiis 2.32. Eatail hprobability 1% when using the criticvalue. This size correspon to the same criticvalue a .05% upper-tailetest, whiis 3.29. 是问H0: u =u0; 备择假设u u0的假设检验的关键值吗还是H0: u =u0; 备择假设u u0的呢

2024-05-04 19:48 1 · 回答

NO.PZ2020010304000048 问题如下 Using the Excel function NORM.S.ST or a normprob-ability table, whare the criticvalues when testing the null hypothesis, H0:μ=μ0H_0: \mu = \mu_0H0:μ=μ0, against a one-silower alternative using a size of 10%? a one-siupper alternative using a size of 20%? a two-sialternative using a size of 2%? a two-sialternative using a size of .1%? The lower-tailecriticvalue is -1.28. The one-siupper-criticvalue is 0.84. A two-sialternative with a size of 2% uses the same criticvalue a one-siupper test, whiis 2.32. Eatail hprobability 1% when using the criticvalue. This size correspon to the same criticvalue a .05% upper-tailetest, whiis 3.29. 老师好，我对于这个双尾和单尾还是有一点模糊。单尾累计10%，如果画出正态分布，那中间的区域去掉头尾不是因该是80%，然后查表是按照80%吗？然后双尾累计2%，不应该是两边各是1%，中间区域按照98%来查表么？请问应该怎么理解才对呢？

2024-03-04 10:02 1 · 回答

NO.PZ2020010304000048 问题如下 Using the Excel function NORM.S.ST or a normprob-ability table, whare the criticvalues when testing the null hypothesis, H0:μ=μ0H_0: \mu = \mu_0H0:μ=μ0, against a one-silower alternative using a size of 10%? a one-siupper alternative using a size of 20%? a two-sialternative using a size of 2%? a two-sialternative using a size of .1%? The lower-tailecriticvalue is -1.28. The one-siupper-criticvalue is 0.84. A two-sialternative with a size of 2% uses the same criticvalue a one-siupper test, whiis 2.32. Eatail hprobability 1% when using the criticvalue. This size correspon to the same criticvalue a .05% upper-tailetest, whiis 3.29. 另外，1、既然是正态分布，假设检验为不等号，那不就是双尾吗，为什么会存在单尾，单尾upper和lower是什么意思呢？2、criticvalue和significant level是什么联系？解题思路可以详细说明一下吗？

2024-02-03 18:12 1 · 回答

NO.PZ2020010304000048 看到您之前回答，有点似懂非懂。 “这题是一道查表题，所有的小问都可以通过查表解决。第一问的是单尾累计10%的概率，那就查表找90%对应的概率，去负数就可以了（因为正态分布是对称的）第二问问的是单尾20%的概率对应分位点，只不过是在均值右侧，所以是正值，直接找表里80%对应的值就行了。第三问是双尾2%的概率，那对应的就是的单尾1%的概率（直接除以2），那就找表格里99%对应的分位点。第四问是双尾0.1%，除以2就是对应单尾0.05%的概率，就去找99.95%对应的分位点就行了。” （1）比如第一问是在z表里先找到0.9，再去定位到关键值吗，（2）为什么涉及负数，这里的单复数怎么看（可不可以把图画一下）谢谢老师

2022-01-21 12:38 2 · 回答

老师，所查的Z表是品职网页上提供下载的那张Z表吗？

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