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Exam 10: Quality Control

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Question 41

Multiple Choice

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A point which is outside of the lower control limit on an R-chart

A) is an indication that no cause of variation is present.
B) should be ignored because it signifies better-than-average quality.
C) should be investigated because an assignable cause of variation might be present.
D) should be ignored unless another point is outside that limit.
E) is impossible since the lower limit is always zero.

F) A) and E)
G) A) and D)

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Question 42

Multiple Choice

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A shift in the process mean for a measured characteristic would most likely be detected by a

A) p-chart.
B) x-bar chart.
C) c-chart.
D) R-chart.
E) s-chart.

F) A) and B)
G) B) and D)

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Question 43

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A c-chart is used to monitor the number of defects per unit for process output.

The basis for a statistical process control chart is a(the)

The following data occurs chronologically from left to right The number of runs up and down is:

Process capability compares process variability to the tolerances.

A p-chart would be used to monitor

The specifications for a product are 6 mm ± 0.1 mm. The process is known to operate at a mean of 6.05 with a standard deviation of 0.01 mm. What is the C_pk for this process?

A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results 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?

The sampling distribution can be assumed to be approximately normal even when the underlying process distribution is not normally distributed.

The primary purpose of statistical process control is to detect a defective product before it is shipped to a customer.

The approaches to quality assurance are

The variation of a sampling distribution isless than the variation of the underlying process distribution.

The chair of the operations management department at Quality University wants to construct a p-chart for determining whether the four faculty teaching the basic P/OM course are in control with regard to the number of students who fail the course. Accordingly, he sampled 100 final grades from last year for each instructor, with the following results What are the .95 (5 percent risk of Type I error) upper and lower control limits for the p-chart?

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

Organizations should work to improve process capability so thatinspection efforts can become more

The process capability index (C_pk) may mislead if (I) the process is not stable.(II) the process output is not normally distributed.(III) the process is not centered.

A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results What is the sample mean service life for sample 2?

The probability of concluding that assignable variation exists when only random variation is present is (I) the probability of a Type I error.(II) known as the alpha risk.(III) highly unlikely.(IV) the sum of probabilities in the two tails of the normal distribution.

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