Question: Hockey pucks used by the National Hockey League NHL and

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.
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  • CreatedJanuary 28, 2015
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