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SkipperLin · 2021年04月09日

请问下面这个答案解释应该怎么理解?谢谢

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NO.PZ201904080100008003

问题如下:

3. Peter would like to test the following hypothesis: H0: B1 ≤ 1 vs. HA: B1> 1 at the 5 % significance level. The calculated t-statistic and the appropriate conclusion are:

Give the t-critical values as follow:

the t-critical values are all two-tails

选项:

Calculated t-statistic
Appropriate conclusion
A.
7.88
Fail to reject H0
B.
7.88
Reject H0
C.
1.679
Reject H0
D.
1.679
Fail to reject H0

解释:

B is correct.

考点:Hypothesis Test in Linear Regression

解析:因为是48个月的数据,所以n=48。本题应该去查单尾95%的df=48-2=46的数据,即双尾90%的df=46的数据。 the critical one-tailed 95% t-value = the critical one-tailed 90% t-value= 1.679

斜率项的t检验值=(1.5863-1)/0.0744=7.88>1.679。所以应该拒绝原假设。

the critical one-tailed 95% t-value = the critical one-tailed 90% t-value= 1.679

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品职答疑小助手雍 · 2021年04月09日

嗨,努力学习的PZer你好:


拿beta-1然后除以beta的标准误就可以得到t检验值,因为检验的是beta小于等于1,or大于1,95%的confidence leve(对应5%的significant level),所以大于1的一边的拒绝(原假设)域要占5%。而表格给的是双尾的情况,单尾的95%是等于双尾的90%的,而根据数据量对应的n-2的自由度是46。所以就要拿前面计算出来的t检验值7.88和46自由度单尾90%的t(1.679)对比。发现前面计算的t检验值大于1.679,那就说明拒绝原假设。也就是有95%的信心认为beta大于1。

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努力的时光都是限量版,加油!

SkipperLin · 2021年04月11日

理解了谢谢老师,不过这句话不应该这么说才合理么the critical one-tailed 95% t-value = the critical two-tailed (我把原来句子的one tailed改成了two tailed) 90% t-value= 1.679

品职答疑小助手雍 · 2021年04月11日

嗨,努力学习的PZer你好:


对,完整是这么说的

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就算太阳没有迎着我们而来,我们正在朝着它而去,加油!

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