Question on control chart

Reference no: EM1390400

Determine the upper and lower control limits for ?- (This Symbol Is Supposed to be an x not an a) and R-charts for the width of a chair seat when sample grand mean (based on 30 samples of 6 observations each) is 27 inches and the average range is 0.35 inches.

Please use Excel.

Reference no: EM1390400

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