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吴奕橦 · 2023年11月04日

请解释公式

NO.PZ2022123001000123

问题如下:

Independent samples drawn from normally distributed populationsexhibit 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:


u1-u2;为什么是0

1 个答案

星星_品职助教 · 2023年11月06日

同学你好,

本题检验的是两个均值是否相等(test the hypothesis that the two population means are equal)。由此建立原假设为:μ1-μ2=0。直接代入即可。