A population’s mean is 30 and the mean of a sample of size 100 is 28.5. The variance of the sample is 25. What is the standard error of the sample mean? A. 0.50. B. 0.05. C. 0.25. D. 2.50.
A population’s mean is 30 and the mean of a sample of size 100 is 28.5. The variance of the sample is 25. What is the standard error of the sample mean?
A、 0.50.
B、 0.05.
C、 0.25.
D、 2.50.
发布时间：2025-07-25 00:36:09
