Webster Chemical Company produces mastics and caulking for the construction Industry. The product is blended in large

Question:

Webster Chemical Company produces mastics and caulking for the construction Industry. The product is blended in large mixers and then pumped into tubes and capped. Management is concerned about whether the tilling process for tubes of caulking lain statistical control. The process should be centered on eight ounces per tube. Several samples of eight tubes were taken, each tube was weighed and the weights in €˜Table were obtained.
a. Assume that only six samples are sufficient and develop the control charts for the mean and the range.
b. Plot the observations on the control chart and comment on your findings.
OUNCES OF CAULKING PERTUBE