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.

  • CreatedJanuary 28, 2015
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