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.
标准误的英文概念是什么? 这题不是应该还有一个变量不变,才能推出选项吧,题条件没说全?