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小媛 · 2021年04月28日

没有懂

NO.PZ2017092702000140

问题如下:

An investment consultant conducts two independent random samples of 5-year performance data for US and European absolute return hedge funds. Noting a 50 basis point return advantage for US managers, the consultant decides to test whether the two means are statistically different from one another at a 0.05 level of significance. The two populations are assumed to be normally distributed with unknown but equal variances. Results of the hypothesis test are contained in the tables below.

The results of the hypothesis test indicate that the:

选项:

A.

null hypothesis is not rejected.

B.

alternative hypothesis is statistically confirmed.

C.

difference in mean returns is statistically different from zero.

解释:

A is correct.

The t-statistic value of 0.4893 does not fall into the critical value rejection regions (≤ –1.984 or > 1.984). Instead it falls well within the acceptance region. Thus, H0 cannot be rejected; the result is not statistically significant at the 0.05 level.

这道题一顿计算还是错的,哎呀,看来是没有懂
1 个答案

星星_品职助教 · 2021年04月28日

同学你好,

这题不用计算,逻辑为(t检验的)拒绝原假设逻辑为:|test statistic|>|critical value|,

根据这个原则,直接选择A,同时排除B&C。

类似的判断是否拒绝原假设的题目,都可以按照这个原则处理。

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