How did Jim conclude that the process was not capable based

on his first set of samples? (Hint: Estimate the process standard deviation, σ, using A2R¯ ≈ 3 __σ




. Does the second set of samples show anything that the

first set did not? Explain what and why.


. Assuming the problem can be found and corrected, what

impact do you think this would have on the capability of the



 Compute the potential process capability using

the second data set.


. If small samples can reveal something that large

samples might not, why not just take small samples in

every situation?