开发者:上海品职教育科技有限公司 隐私政策详情

应用版本:4.2.11(IOS)|3.2.5(安卓)APP下载

上小学 · 2023年03月26日

请问查的T分布表吗?表格纵轴只有自由度,横轴是P?请问这个P是指 PVALUE?具体怎么查的呢?

NO.PZ2020010304000049

问题如下:

Find the p-value for the following t-test statistics of the null hypothesis, H0:μ=μ0H_0: \mu = \mu_0.

a. Statistic: 1.45, Alternative: Two-sided

b. Statistic: 1.45, Alternative: One-sided upper

c. Statistic: 1.45, Alternative: One-sided lower

d. Statistic: -2.3, Alternative: One-sided upper

e. Statistic: 2.7, Alternative: Two-sided

解释:

a. In a two-sided test, the p-value is the area under the normal curve for values greater than 1.45 or less than -1.45. This is twice the area less than -1.45, or 2 * 0.074. = .148.

b. In a one-sided upper test, we need the area above 1.45. This is half the previous answer, or 0.074.

c. In a one-sided lower test, we need the area under the curve for values less than 1.45. This is just 1 - 0.074 = .926.

d. Here we need to probability under the normal curve for values above -2.3, which is 1 minus the area less than -2.3, or 1 - 0.01 = 0.99.

e. Because it is a two-sided alternative, we need that area for values larger than 2.7 or less than -2.7, which is twice the area less than -2.7. This value is 2 * .0034 = .0068.

如何在T分布表上找到PVALUE?烦请逐步说一下,谢谢。实在找不到那几个数字在哪里?T分布表格里哪个是指几倍的标准差?

3 个答案
已采纳答案

李坏_品职助教 · 2023年03月29日

嗨,努力学习的PZer你好:


考试中大部分考题都是给你一个概率值,比如α=0.05的情况下,自由度告诉你,然后让你去找t值。


计算p value应该是考不到的。

----------------------------------------------
虽然现在很辛苦,但努力过的感觉真的很好,加油!

李坏_品职助教 · 2023年03月26日

嗨,爱思考的PZer你好:


嗨,爱思考的PZer你好:


题目是让你根据不同的t统计量,在t分布表里面查找对应的p value。(一般的t分布表可能给不了那么全面的数据,这道题在考试中不会这么考的,考试中会直接给你p=0.05或者0.025的t值,让你去判断是否拒绝H0)


比如第一问,给的t值是1.45,要求是双尾检验。所以是求t值大于1.45的部分 + t值小于-1.45的部分。这里没有给自由度,可以默认为n比较大,比如n=50。


利用excel:

----------------------------------------------
加油吧,让我们一起遇见更好的自己!

李坏_品职助教 · 2023年03月26日

嗨,努力学习的PZer你好:


常见的t分布表:

纵轴是自由度n, 横轴第一行是单尾的概率,横轴第二行是双尾的概率。

----------------------------------------------
加油吧,让我们一起遇见更好的自己!

上小学 · 2023年03月29日

理解了,谢谢老师,我也不会使用EXCEL公式,没可能做出来的。在T分布表中,给出自由度,给出单双尾的概率后,可以查到关键值。那么,考试会考计算PVALUE吗?从T表中需要学会如何看谁是PVALUE吗?谢谢

  • 3

    回答
  • 0

    关注
  • 748

    浏览
相关问题

NO.PZ2020010304000049 问题如下 Finthe p-value for the following t-test statistiof the null hypothesis, H0:μ=μ0H_0: \mu = \mu_0H0​:μ=μ0​. Statisti1.45, Alternative: Two-siStatisti1.45, Alternative: One-siupper Statisti1.45, Alternative: One-silower Statisti-2.3, Alternative: One-siupper e. Statisti2.7, Alternative: Two-si In a two-sitest, the p-value is the area unr the normcurve for values greater th1.45 or less th-1.45. This is twithe area less th-1.45, or 2 * 0.074. = .148.In a one-siupper test, we neethe area above 1.45. This is half the previous answer, or 0.074.In a one-silower test, we neethe area unr the curve for values less th1.45. This is just 1 - 0.074 = .926. Here we neeto probability unr the normcurve for values above -2.3, whiis 1 minus the area less th-2.3, or 1 - 0.01 = 0.99.e. Because it is a two-sialternative, we neetharea for values larger th2.7 or less th-2.7, whiis twithe area less th-2.7. This value is 2 * .0034 = .0068. 老师好,没看懂答案里的数字从哪来的。看其他同学的提问,给的解答用Excel计算的。这题本身是不是漏了条件,或者请具体一下题目,考试时是否会出类似的题目?直接这么出题看着无法解答。

2024-05-29 18:08 1 · 回答

NO.PZ2020010304000049 问题如下 Finthe p-value for the following t-test statistiof the null hypothesis, H0:μ=μ0H_0: \mu = \mu_0H0​:μ=μ0​. Statisti1.45, Alternative: Two-siStatisti1.45, Alternative: One-siupper Statisti1.45, Alternative: One-silower Statisti-2.3, Alternative: One-siupper e. Statisti2.7, Alternative: Two-si In a two-sitest, the p-value is the area unr the normcurve for values greater th1.45 or less th-1.45. This is twithe area less th-1.45, or 2 * 0.074. = .148.In a one-siupper test, we neethe area above 1.45. This is half the previous answer, or 0.074.In a one-silower test, we neethe area unr the curve for values less th1.45. This is just 1 - 0.074 = .926. Here we neeto probability unr the normcurve for values above -2.3, whiis 1 minus the area less th-2.3, or 1 - 0.01 = 0.99.e. Because it is a two-sialternative, we neetharea for values larger th2.7 or less th-2.7, whiis twithe area less th-2.7. This value is 2 * .0034 = .0068. 题干是说statistic值为T分布,然后求P-value吗?a.解析中,前半部分是说P-value指小于-1.45和大于1.45的面积,理解对吗?后半部分“this is twithe area less th-1.45, or 2 * 0.074. = .148.”应该怎么理解呢?这道题考点和解题思路是什么呢?谢谢。

2024-02-06 23:38 1 · 回答

NO.PZ2020010304000049请问这题没有给sample size 或自由度 怎么查表呀

2021-12-27 21:23 1 · 回答

e问里的2.3和2.7,为什么我在表里没找到,是我的表不够完整吗…

2020-10-17 23:25 1 · 回答