Question: Consider the data set shown in Table, representing the thicknesses of a protective coating.
a. Find the average, X, and the range, R, for each sample.
b. Find the overall average, X, and the average range, R.
c. Find the center line for the X chart.
d. Find the control limits for the X chart.
e. Draw the X chart.
f. Comment on what you see in the X chart. In particular, is this process in control? How do you know?
g. Write a paragraph, as if to your supervisor, summarizing the situation and defending the action you feel is appropriate.
