A Random Sample of 100 Rods from a Process with a Mean

Multiple Choice

A random sample of 100 rods from a process with a mean of 20 feet produced a sample mean of 20.01 feet and a standard deviation of 0.015.This difference between the process mean and the sample mean is likely to be:

A) assignable variation.
B) special-cause variation.
C) random variation.
D) homoscedasticity.
E) costs of attrition.