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Chapter 06, Problem 8
A tire manufacturer has been concerned about the number of defective tires found recently. In order to evaluate the true magnitude of the problem, a production manager selected ten random samples of twenty units each for inspection. The number of defective tires found in each sample are as follows:

Develop a p-chart with a z = 3.
Note. If the lower control limit is negative, round the LCL to zero.
CL = , round your answer to 3 decimal places, the tolerance is +/-0.001
UCL = , round your answer to 3 decimal places, the tolerance is +/-0.002
LCL = , round your answer to 3 decimal places, the tolerance is +/-0.002

Suppose that the next four samples selected had 6, 3, 3, and 4 defects. What conclusion can you make?
The process is out of control.
The process is in control.

  • statistics -

    The process is out of control

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