Hockey pucks used by the National Hockey League (NHL) and other professional leagues weigh an average of 163 grams (5.75 ounces). A quality inspector monitors the manufacturing process for hockey pucks. She takes eight samples of n=10. Measured in grams, the weights appear in the table below. It is believed that puck weights are normally distributed, and when the production process is in control, µ=163 and σ=7.5. A portion of the data, measured in grams, is shown in the accompanying table; the complete data, labeled Hockey Puck , are available on the text website.

In a report, use the above information to:
1. Prepare a control chart that specifies a centerline as well as an upper control limit
(UCL) and a lower control limit (LCL).
2. Use the control chart to determine whether the process is incontrol.

Transcribed Image Text:

Data for Case Study 7.3 Hockey Puck Weights (in grams) #8 186.8 178.3 159.8 166.2 1564 173.3 175.8 1714 1604 163.0 #1 #3 156.4 #4 #5 #6 167.0 #2 #7 162.2 165.8 165.3 168.6 160.3 160.6 52.2 1664 68.2 168.4 76.8 171.3