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.
C
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Answer the following statement true (T) or false (F)