Are you talking about the standard error of the mean?
http://www.google.com/search?client=safari&rls=en&q=standard+error+of+the+mean&ie=UTF-8&oe=UTF-8
Why do most of the sample means differ somewhat from the population mean? What is this difference called?
2 answers
This is one of the questions that is asked in the back of the fifth edition of elementary statistics book. I am not sure of the answer, the number of the problem is an even number. Meaning that I cannot see the the answer in the back of the book:( So I was wondering if anyone could help me understand it as well.