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Ella · 2024年05月04日

a小题是什么意思

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, H0:μ=μ0H_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%?

选项:

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.

是问H0: u>=u0; 备择假设u

还是H0: u<=u0; 备择假设u>u0的呢

1 个答案
已采纳答案

李坏_品职助教 · 2024年05月04日

嗨,从没放弃的小努力你好:


a小问的意思是:单尾检验,α(显著性水平)为10%的情况下,左尾的critical value(关键值)是多少?


所谓左尾关键值,也就是问你负的critical value是多少,这个可以用excel里面的函数:

得出关键值是-1.28. 一般来说用到左尾关键值的是H0: u<=u0.





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努力的时光都是限量版,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. 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

NO.PZ2020010304000048比如题,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?

2021-08-01 11:27 1 · 回答