EBK OM
6th Edition
ISBN: 9781305888210
Author: Collier
Publisher: YUZU
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Question
Chapter 16, Problem 9PA
Summary Introduction
Interpretation: The control limits needs to be determined for c chart based on the given information.
Concept Introduction:A c chart helps in monitoring the number of defects in the process over time and improvement decisions can be made based on the control chart.
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 A fast food franchise tracked the number of errors that occurred in customers orders. These included;
* wrong menu items
*wrong size drink
*lack of condiments
*wrong price total
*and so on...
Some orders may have more than one error.
In one week, 1500 orders were filled, and a total of 72 errors were discovered.
Find the control limits for a
C – Chart to monitor the number of errors per order. Is order accuracy, good or bad ?
Explain.
The school board is trying to evaluate a new math program introduced to second-graders in five elementary schools across the county this year. A sample of the student scores onstandardized math tests in each elementary school yielded the following data: Construct a c-chart for test errors, and set the control limits to con tain 99 .73% of the random variation in test scores. What does the chart tell you? Has the new math program been effective?
Determine X=�= and R¯¯¯�¯ .
Note: Round your answers to 3 decimal places.
2:
Determine the UCL and LCL for a X−�− chart.
Note: Round your answers to 3 decimal places.
3:
Determine the UCL and LCL for R-chart.
Note: Leave no cells blank - be certain to enter "0" wherever required. Round your answers to 3 decimal places.
4:
What comments can you make about the process?
multiple choice
Process is in statistical control
Process is out of statistical control
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