Toby took a sample of 4 employees at his company and looked at how many years they had each
worked for the company. Here is what he found:
Employee
Experience (years)
Jim Pam Dwight
6
5
9
Angela
8
Toby found their mean was = 7 years. He thinks the standard deviation is
(6-7)+(5-7)+(9-7)+(8-7)
3
What is the error in Toby's standard deviation calculation?