8.24 Even more on bias and reliability. Exercise 8.22 gives five true values for lengths. A subject measures the first length (true length = 2.9 inches) four times by eye. His measurements are
3.0 2.9 3.1 3.0
Suppose his measurements have a bias of +0.1 inch.
(a) What are the four random errors for his measurements?
(b) What is the variance of his four measurements?