问题如下:
If analyst collect a random sample of 100 students in school with 1000 students, and we found the sample mean heights under 1.7 centimeters, but the population mean heights is 1.8 centimeters. A friend has asked you to explain the differences between sample mean and population mean. Which of the following will you most likely include in your explanation?
选项:
A. because of sampling error
B. because of sampling distribution
C. because of systematic sampling
解释:
A is correct, because any difference between the sample mean and the population mean is called sampling error.
老师,请问这个知识点是在哪里讲的?没有印象