Customers in the sample group returned for warranty repairs

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Reference no: EM131433240

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 0.09. Eachmonth, Garcia tracks 70 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 two standard deviations on either side of the goal, determine the control limits for this chart. In March, 12 of the 70 customers in the sample group returned for warranty repairs. Is the repair process incontrol? The UCLp equals ( ) and the LCLp equals ( ). (Enter your responses rounded to three decimal places.)

Reference no: EM131433240

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