NO.PZ2022071202000095
问题如下：
Question
Using a two-tailed test of the hypothesis that the population mean is zero, the calculated test statistic is 2.51. The sample has 23 observations. The population is normally distributed with an unknown variance.
An analyst will most likely reject the null hypothesis at significance levels of:
选项：
A.0.10 only.
B.0.10, 0.05, and 0.01.
C.0.10 and 0.05.
解释：
Solution
C is correct. This is a two-tailed hypothesis testing because it concerns whether the population mean is zero.
H0: μ = 0 versus Ha: μ ≠ 0
With degrees of freedom (df) = n - 1 = 23 - 1 = 22, the rejection points are as follows:
Because the calculated test statistic is 2.51, the null hypothesis is thus rejected at the 0.05 and 0.10 levels of significance but not at 0.01.
A is incorrect. As explained in choice C.
B is incorrect. As explained in choice C.
请问表格里给出的都是单边α的值吗？
