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Exam 10: Quality Control

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Question 21

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Even if the process is not centered, the process capability index (indicated by Cpk) is very useful.

A) True
B) False

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Question 22

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Which of the following is not a step in the quality control process?

A) define what is to be controlled
B) compare measurements to a standard
C) eliminate each of the defects as they are identified
D) take corrective action if necessary
E) evaluate corrective action

F) B) and D)
G) None of the above

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Question 23

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Low-cost, high-volume items often require more intensive inspection.

If the process proportion of defectives is unknown, what is the alpha risk (probability of Type I error) for upper and lower control limits of .115 and .085 respectively? .13 and .07? .145 and .055?

If the process is known to have a mean of 15 and a standard deviation of 3, using three sigma control limits, do any of the sample means indicate an out-of-control process mean?

If he uses upper and lower control limits of 22 and 18 ounces, on what day(s) , if any, does this process appear to be out of control?

The process capability index (indicated by Cpk) can be used only when the process is centered.

Studies on a machine that molds plastic water pipe indicate that when it is injecting 1-inch diameter pipe, the process standard deviation is 0.05 inches.The one-inch pipe has a specification of 1-inch plus or minus 0.10 inch.What is the process capability index (Cpk) if the long-run process mean is 1 inch?

Studies on a bottle-filling machine indicates it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces.What is the process specification, assuming the Cpk index of 1?

If he uses upper and lower control limits of 22 and 18 ounces, what is his risk (alpha) of concluding this process is out of control when it is actually in control (Type I error) ?

If he uses upper and lower control limits of 520 and 480 hours, on what sample(s) (if any) does service life appear to be out of control?

What is the estimate of the standard deviation of the sampling distribution for an instructor's sample proportion of failures?

Suppose the criterion for evaluating this process is that the appropriate capability index must be at least 1.3.With a long-run process mean of 0.09 and a standard deviation of 0.015, is this process capable?

"Quality of conformance" is concerned with whether a product or service conforms to its specifications.

A time-ordered plot of sample statistics is called a(n) ______ chart.

If the process is known to produce 11 percent defectives on average, using three sigma control limits, do any of the sample proportions indicate an out-of-control process proportion of defectives?

What is the sample mean for machine #1?

Approximately 99.7% of sample means will fall within $\pm$ two standard deviations of the process mean if the process is under control.

Assuming that the process mean of 0.09 cannot be changed, what process standard deviation would be required for this process to be considered capable (assuming that a capable process must have a capability index of at least 1.3)?

Variation in a sample statistic collected from a process may be either random variation or assignable variation - or both.