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Business, 02.06.2021 22:30 TMeansStupidity

​Garcia's Garage desires to create some colorful charts and graphs to illustrate how reliably its mechanics​ "get under the hood and fix the​ problem." The historic average for the proportion of customers that return for the same repair within the​ 30-day warranty period is 0.12. Each​ month, Garcia tracks 90 customers to see whether they return for warranty repairs. The results are plotted as a proportion to report progress toward the goal. If the control limits are to be set at three standard deviations on either side of the​ goal, determine the control limits for this chart. In​ March, 4 of the 90 customers in the sample group returned for warranty repairs. Is the repair process in​ control?

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