Posted by **Brenda** on Saturday, November 12, 2011 at 5:46pm.

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.

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