A Psychology Professor Wanted to Describe His/her Class in Terms

Multiple Choice

A psychology professor wanted to describe his/her class in terms of the personality characteristic of introversion/extroversion.The population variance was estimated to be 2.56.What does this mean?

A) When the professor uses the population mean to predict individuals' scores,he/she should expect to be in error by about 2.56.
B) When the professor uses the population mean to predict individuals' scores,he/she should expect to be more accurate by about 2.56.
C) It is impossible to tell because the mean is not known.
D) The sample mean differs from the population mean by about 2.56.