Historic average for the proportion of customers

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Reference no: EM13904230

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 .11 Each? month, Garcia tracks 80 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, 15 of the 80 customers in the sample group returned for warranty repairs. Is the repair process in? control?

Reference no: EM13904230

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