这个不是2tail吗

问题如下：

Question A two-tailed t-test of the hypothesis that the population mean differs from zero has a p-value of 0.0275. Using a significance level of 5%, the most appropriate conclusion is:

选项：

A.to accept the null hypothesis.

B.that the chosen significance level is too high.

C.to reject the null hypothesis.

解释：

C is correct. The p-value is the smallest level of significance at which the null hypothesis can be rejected. In this case, the given p-value (0.0275) is less than the given level of significance (0.05); therefore, the null hypothesis is rejected.

A is incorrect. Candidates might misunderstand the use of p-value or they may have incorrectly doubled the p-value or inappropriately, in this example, divided the significance level by two.

B is incorrect. The p-value is the smallest level of significance at which the null hypothesis can be rejected. In this case, the given p-value (0.0275) is less than the given level of significance (0.05); therefore, the null hypothesis is rejected.