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Exam 3: Statistical Process Control

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Question 51

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Possible root causes of special cause variation include all of the following except

A) operator error.
B) process out of adjustments.
C) over producing.
D) defective materials.

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Question 52

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Information from an R-chart can be used to construct the control limits for an -chart.

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Question 53

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Which of the following statements concerning control chart limits is true?

The process centre line for both and R-charts are both the same value because they are based on the same raw data.

A process capability ratio reflects the number of (Z)sigmas included in the range between the upper and lower control limits.

Variable control charts are used for quantitative measures such as weight or time.

In general,a process is considered to be in control for all the following conditions except

When special cause variation is detected,it is normally eliminated by increasing the number of standard deviations (z value)used to calculate the control limits.

The smaller the historical proportion defective reported for a process,the larger the sample size required to detect special cause variation with a p-chart.

Control limits are based on the special cause variation inherent in a process.

The formula used to determine the upper and lower control limits is based on specification limits.

Special cause variation can be identified using statistical process control.

Defect and defective mean the same thing for attribute (qualitative)control charts.

What is a c-chart and when is it used?

Statistical process control is a tool used to monitor and improve quality.

A company manufactures a product that has a design (nominal) target width of 5 inches with tolerances of + .05 inch.The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch.The process capability ratio for this process is

With a c-chart,the sample size is small and often contains only one item.

Process control charts are often used at a critical point after which it is difficult to correct or rework the process output.

If the quality of a process's output is determined by the difference between the largest and smallest values in a sample,use a(n) ___ control chart.

Which of the following control charts are based on sample sizes as small as one?