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.

Question

Quizplus · Accepted Answer

The small difference between the process mean and the sample mean (0.01 feet) is within the realm of random variation and is not large enough to be considered special-cause or assignable variation. Homoscedasticity refers to the equal variance of a variable across different levels, which is not relevant here. Costs of attrition are also not relevant to this scenario.

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