A population has a known mean of 100. Suppose 36 samples are randomly drawn from this population with replacement. The observed mean is 97.8 and the standard deviation is 10. The standard error of the sample mean is closest to:
选项:
A: 0.8165.
B: 1.667.
C: 1.8165.
发布时间:2024-06-12 21:28:03