Each day 500 inventory control records are cycle-counted for errors. These counts have been made over a period of 20 days and have resulted in the following proportion of records found in erroreach day: .0025 .0075 .0050 .0150 .0125 .0100 .0050 .0025 .0175 .0200 .0150 .0050 .0150 .0125 .0075 .0150 .0250 .0125 .0075 .0100a. Calculate the center line, upper control limit, andlower control limit for a p control chart.b. Plot the 20 points on the chart and determine which ones are in control.c. Is the process stable enough to begin using these data for quality control purposes?
Each day 500 inventory control records are cycle-counted for errors. These counts have been made over a period of 20 days and have resulted in the following proportion of records found in erroreach day: .0025 .0075 .0050 .0150 .0125 .0100 .0050 .0025 .0175 .0200 .0150 .0050 .0150 .0125 .0075 .0150 .0250 .0125 .0075 .0100a. Calculate the center line, upper control limit, andlower control limit for a p control chart.b. Plot the 20 points on the chart and determine which ones are in control.c. Is the process stable enough to begin using these data for quality control purposes?
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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Each day 500 inventory control records are cycle-counted for errors. These counts have been made over a period of 20 days and have resulted in the following proportion of records found in error
each day: .0025 .0075 .0050 .0150 .0125 .0100 .0050 .0025 .0175 .0200 .0150 .0050 .0150 .0125 .0075 .0150 .0250 .0125 .0075 .0100
a. Calculate the center line, upper control limit, andlower control limit for a p control chart.
b. Plot the 20 points on the chart and determine which ones are in control.
c. Is the process stable enough to begin using these data for quality control purposes?
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