A manufacturing plant make wind mill assemblies & can produce 50 units in a month in two
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Question:
A manufacturing plant make wind mill assemblies & can produce 50 units in a month in two period of 15 days each ; following is the data for number of defects arising per month.
Month | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC |
Number of Defects per period | 4 3 | 3 2 | 1 0 | 4 5 | 6 7 | 7 7 | 9 6 | 5 4 | 2 3 | 0 2 | 2 3 | 4 3 |
Questions:
1. Which control chart should be used for the above data and why?
2. Make the appropriate control chart on a graph paper.
3. Interpret the chart and give your recommendation. Whether the process is in control or not?
Related Book For
Managing Controlling and Improving Quality
ISBN: 978-0471697916
1st edition
Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund
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