Question

A company that makes basketballs has the motto: “Our basketballs are ready to play.” Therefore, it is important to the company that the basketballs are inflated with the proper amount of air when shipped. Most basketballs are inflated to 7 to 9 pounds per square inch. From a set of calibration data, the following statistics were measured:
Recently the company selected a random basketball from its production line at four different time periods over its normal production day. The results were recorded and listed in the following table.
a) Create an X chart based on the calibration data statistics for these 30 samples.
b) Create an R chart based on the calibration data statistics for these 30 samples.
c) Assuming that the process was in control during the calibration period, is the company’s process for filling its basketball with the proper amount of air in control?


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  • CreatedMay 15, 2015
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