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Upper and lower control limits for /x- and R-charts

Find the upper and lower control limits for /x- and R-charts for the width of a chair seat when the sample grand mean (based on 30 samples of 6 observations each) is 27.0 inches, and the average range is 0.35 inches.

Solution Preview

Since sample size= 6
A2= 0.48
D3= 0
D4= 2.00

Mean of ...

$2.19