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Exam 10: Quality Control

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Question 71

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Concluding a process is out of control when it is not is known as a Type I error.

A) True
B) False

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Question 72

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An analyst counted 17 A/B runs and 15 U/D runs in 26 time series observations.Do these results suggest that the data are non-random?

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These results do not suggest ...

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Question 73

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Processes that are in control eliminate variations.

If, when the coating process is in control, the long-run average is 0.09 millimeters, what metric would be used to assess this process' capability?

The output of a process may not conform to specifications even though the process may be statistically "in control."

What is the estimate of the process proportion of defectives for whenever it is under control?

If the process proportion of defectives is unknown, what are the upper and lower control limits for an alpha risk of .10? .05? .01?

The optimum level of inspection occurs when we catch at least 98.6 percent of the defects.

What is the sample mean package weight for Thursday?

What is the standard deviation of the sampling distribution of sample means for whenever this process is under control?

A process results in a few defects occurring in each unit of output.Long-run, these defects should be monitored with ___________.

Control limits are based on multiples of the process standard deviation.

A p-chart would be used to monitor _______.

An "up and down" run test uses the median as a reference point and measures the percentage above and below the median.

The chart below depicts 16 sample means that were taken at periodic intervals and plotted on a control chart.Does the output appear to be random?

Perform run tests on the given data.What can you conclude?

The amount of inspection we choose can range from no inspection at all to inspecting each item numerous times.

When a process is not centered, its capability is measured in a slightly different way.The symbol for this case is Cpk.

Larger samples will require wider x-bar control limits because there is more data.

Given the following control chart, would you say that the process appears to be performing appropriately?