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Exam 3: Statistical Process Control

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Question 51

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

A) The smaller the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process.
B) The larger the value of z,the more narrow the control limits are and the more sensitive the chart is to changes in the production process.
C) The smaller the value of z,the wider the control limits are and the less sensitive the chart is to changes in the production process.
D) The larger the value of z,the more narrow the control limits are and the less sensitive the chart is to changes in the production process.

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Question 52

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

A) no points are outside the control limits.
B) all points are above the centre line.
C) the points are randomly distributed following a normal population.
D) no pattern exists in the plotted points (no evidence of a run) .

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Question 53

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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.

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

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

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.

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

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

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

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

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

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

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

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

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

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

Special cause variation can be identified using statistical process control.

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

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.

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