Quality (February 2008) presented a problem that actually occurred at a company that produces process pumps for a variety of industries. The company recently introduced a new pump model and immediately began receiving customer complaints about "leaky pumps." There were no complaints about the old pump model. For each of the first 13 weeks of production of the new pump, quality-control inspectors tested 500 randomly selected pumps for leaks. The results of the leak tests are summarized by week in the accompanying table. Construct an appropriate control chart for the data. What does the chart indicate about the stability of the process?

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Number with Leaks Week Number Tested 500 500 500 500 500 500 500 500 500 500 500 500 24 26 20 56 26 10 11 12 26 26 13 500