Snee has measured the thickness of the “ears” of paint cans. (The “ear” of a paint can is the tab that secures the lid of the can.) At periodic intervals, samples of five paint cans are taken from a hopper that collects the production from two machines, and the thickness of each ear is measured. The results (in inches × 1000) of 30 such samples are as follows:
(a) Calculate the values of
(b) Use the values of A3 and s to construct an x chart.
(c) Construct an s chart.
(d) Use the values of A2 and R to construct an x chart.
(e) Construct an R chart.
(f) Do the charts indicate that these fill weights are in statistical control?

  • CreatedOctober 12, 2015
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