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甜甜圈洞 · 2024年01月22日

sP的平方不是2678.05的平方吗

  1. Quantitative

NO.PZ2022123001000123

问题如下：

Independent samples drawn from normally distributed populations exhibit the following characteristics:


Assuming that the variances of the underlying populations are equal, the pooled estimate of the common variance is 2,678.05. The t-test statistic appropriate to test the hypothesis that the two population means are equal is closest to:

选项：

A.

0.94

B.

1.90

C.

0.29

解释：

The t-statistic for the given information (normally distributed populations, population variances assumed equal) is calculated as:


sP的平方不是2678.05的平方吗

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1 个答案

品职助教_七七 · 2024年01月23日

嗨，从没放弃的小努力你好：


Sp是standard deviation。题干中给的2678.05是variance，所以已经是Sp的平方，不需要再平方了。

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虽然现在很辛苦，但努力过的感觉真的很好，加油！

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