Baseballs used in the major leagues in the United States must adhere to strict standards. One such standard is that the weight must be between 5 and 5.25 ounces. One could look at this standard as a target weight of 5.125 ounces with a tolerance of +/€“ 0.125 ounces. The following data were taken from a random sample of 50 baseballs from a large production batch. The actual weight and deviation from the target weight are listed.

Using the specification limits as the control limits,
a)€‚Create a run chart for the baseballs€™ weights.
b)€‚Is the process for making baseballs in control?
c)€‚How many baseballs produced were out of spec?
d)€‚When should the quality team have investigated the production process?

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