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, and lower 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 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, and lower 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?
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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, and lower 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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