问题如下：
The standard deviation of the parameter estimate decreases as the ：
选项：
A. sample size increase
B. sample size decrease
C. standard error is increase
解释：
A is correct, the accuracy of the parameter estimate increase as the sample size increase, the standard error of the sample mean falls, and standard deviation also decrease.
老师、请问总体特征不是用parameter吗？这里表示的是总体的标准误？不是应该是样本的标准误吗 of statistic 吗？