The table lists the number of defective 60-watt light-bulbs found in samples of 100 bulbs selected over
Question:
a. Construct a p chart to monitor the manufacturing process, and plot the data.
b. How large must the fraction of defective items be in a sample selected from the manufacturing process before the process is assumed to be out of control?
c. During a given day, a sample of 100 items is selected from the manufacturing process and 15 defective bulbs are found. If a decision is made to shut down the manufacturing process in an attempt to locate the source of the implied controllable variation, explain how this decision might lead to erroneous conclusions.
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Related Book For
Introduction To Probability And Statistics
ISBN: 9781133103752
14th Edition
Authors: William Mendenhall, Robert Beaver, Barbara Beaver
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