The Canine Gourmet Company produces delicious dog treats for canines with discriminating tastes. Management wants the box filling line to be set so that the process average weight per packet is 45 grams. To make sure that the process is in control an inspector at the end of the filling line periodically selects a random box of 10 packets and weighs each packet. When the process is in control the range in the weight of each sample has averaged 6 grams.
a. Design an R and an chart for this process
b. The results from the last 5 samples of 10 packets are shown in the attached file. Is the process in control? Explain.