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
√
__
n
.)
. 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
process?
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?
