Determine the upper and lower control limits of the R-chart, where s = 3. 1 answer below »

Thirty-five samples of size 7 each were taken from a fertilizer-bag-filling machine. The results were: Overall mean = 57.75 lb; Average range = 1.78 lb.

a) Determine the upper and lower control limits of the x – chart, where s = 3.

b) Determine the upper and lower control limits of the R-chart, where s = 3.