没明白A错在哪？ 样本量越大，置信区间不应该越大么？我记得何老师讲过，说越是要涵盖多的信息，越是要滴水不漏，所以置信区间应该更大啊

问题如下：

An increase in sample size is most likely to result in a:

选项：

wider confidence interval.

decrease in the standard error of the sample mean.

lower likelihood of sampling from more than one population.

解释：

B is correct.

All else being equal, as the sample size increases, the standard error of the sample mean decreases and the width of the confidence interval also decreases.

在其他条件相同的情况下，随着样本量的增加，样本均值的标准误差会减小，置信区间的宽度也会减小。