Which of the following statements is correct? A. sigma is the average distance between an individual in a population and the population mean. B. s is the average distance between an individual in a...

Which of the following statements is correct?

A. sigma is the average distance between an individual in a population and the population mean.

B. s is the average distance between an individual in a sample and the population mean.

C. sigma/√n(or sigma √n if sigma is unknown) is the average distance between a sample mean of size n and the population mean.

D. Both A and C.