A sample of size n=25 is selected from a n
题型:单项选择题
问题:
A sample of size n=25 is selected from a normal population. This sample has a mean of 15 and a sample variance of 4. What is the standard error of the sample mean()
A. 2.0.
B. 0.4.
C. 0.8.
A sample of size n=25 is selected from a normal population. This sample has a mean of 15 and a sample variance of 4. What is the standard error of the sample mean()
A. 2.0.
B. 0.4.
C. 0.8.