In Gr’s Garage, the proportion of average number of customers who comes back again for the same fault is 0.10, during the warranty period of 30 days. Every month, 100 customers are tracked by Gr, in order to find out whether they are returning for same repair works during the warranty period and the same is plotted as proportion to report progress against goal. By setting the control limits on both sides of goal, at two standard deviations, the control limit for the chart needs to be determined. From the sample group 8 customers out of 100, has returned for repairs, for which the repair process is under control or not, needs to be assessed. Interpretation: The standard deviation gives information as to how various values are spread out when compared to the mean value.

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Chapter 3, Problem 11P

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Case Summary: In Gr’s Garage, the proportion of average number of customers who comes back again for the same fault is 0.10, during the warranty period of 30 days. Every month, 100 customers are tracked by Gr, in order to find out whether they are returning for same repair works during the warranty period and the same is plotted as proportion to report progress against goal. By setting the control limits on both sides of goal, at two standard deviations, the control limit for the chart needs to be determined. From the sample group 8 customers out of 100, has returned for repairs, for which the repair process is under control or not, needs to be assessed.

Interpretation: The standard deviation gives information as to how various values are spread out when compared to the mean value.

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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. each month, Garcia track 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 two standard deviations on either side of the goal, determine the control limits for this chart. In March, 14 of the 80 customers in the sample group returned for warranty repairs. Is the repair process in control? The UCL Subscript p equals and the LCL Subscript p equals (Enter your responses rounded to three decimal places.)

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 0.10. Each month,Garcia tracks 100 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, 8 of the 100 customers in the sample group returned for warranty repairs. Is the repair process in control?

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. Each month, Garcia tracks 110 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, 17 of the 110 customers in the sample group returned for warranty repairs. Is the repair process in control? The UCL, equals and the LCL, equals (Enter your responses rounded to three decimal places.)