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sparkle · 2022年02月13日

这个题应该放到后面与讲义内容对应的地方

NO.PZ2017092702000162

问题如下:

The following table shows the sample correlations between the monthly returns for four different mutual funds and the S&P 500. The correlations are based on 36 monthly observations. The funds are as follows:


Test the null hypothesis that each of these correlations, individually, is equal to zero against the alternative hypothesis that it is not equal to zero. Use a 5 percent significance level.





选项:

解释:

The critical t-value for n − 2 = 34 df, using a 5 percent significance level and a two-tailed test, is 2.032. First, take the smallest correlation in the table, the correlation between Fund 3 and Fund 4, and see if it is significantly different from zero. Accoding to the formula of correlaion t-test, its calculated t-value is t=1.903. This correlation is not significantly different from zero. If we take the next lowest correlation, between Fund 2 and Fund 3, this correlation of 0.4156 has a calculated t-value of 2.664. So this correlation is significantly different from zero at the 5 percent level of significance. All of the other correlations in the table (besides the 0.3102) are greater than 0.4156, so they too are significantly different from zero.

这个题应该放到后面与讲义内容对应的地方

1 个答案

袁园_品职助教 · 2022年02月14日

嗨,爱思考的PZer你好:


好的,感谢指正,我们会在后台重新修改一下知识点分类的

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

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