In order to test whether the mean IQ of em

问题单项选择题

In order to test whether the mean IQ of employees in an organization is greater than 100, a sample of 30 employees is taken and the sample value of the computed test statistic, t_n-1=3.4. The null and alternative hypothesis are:（）

A. H₀: μ=100; H_a: μ≠100.

B. H₀: μ≤100; H_a: μ＞100.

C. H₀: X=100; H_a: X≠100.

答案

参考答案：B

解析：

The null hypothesis is that the theoretical mean is not significantly greater than 100. The alternative hypothesis is that the theoretical mean is greater than 100.