NO.PZ2015120604000115
问题如下:
The mean of a sample is 15 and its standard deviation is 2.5.The size of the sample is 64. The standard error of this sample should be:
选项:
A.
0.02.
B.
0.31.
C.
4.00.
解释:
B is correct.
是否可以解释一下这个题目中the mean of sample,standard deviation和standard erro的关系,虽然知道如何计算,但是三者的关系感觉不是很理解