# Question

Baseballs used in the major leagues in the United States must adhere to strict standards. One such standard is that the circumference must be between 9 and 9.25 inches. One could look at this standard as a target circumference of 9.125 inches with a tolerance of +/ -0.125 inches. These data (shown at the bottom of the page) were taken from a random sample of 50 baseballs from a large production batch. The actual circumference and deviation from the target circumference are listed. Using the specification limits as the control limits,
a) Create a run chart for the baseballs’ circumferences.
b) Is the process for making baseballs in terms of their circumference in control?
c) How many baseballs produced were out of spec?

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