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.
老师这道题目出错了吗?标准方差减少,只能推出标准误减少,但不能推出样本量是增加还是减少了呀,麻烦解释下这道题的意思,谢谢!