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Exam 10: A: Statistical Quality Control

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Question 31

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The sampling distribution of sample means taken from a process has less variability than the distribution of the process.

A) True
B) False

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Question 32

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Typically the production of high-cost,low-volume items require little quality control inspection.

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B) False

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Question 33

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"Process capability" compares "process variability" to the "design specifications".

The six sigma quality improvement methodology is called:

If he uses upper and lower control limits of 520 and 480 hours,what is his risk (alpha) of concluding service life is out of control when it is actually under control (Type I error) ?

What is the standard deviation of the sampling distribution of sample means?

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

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

When a process is not centred,its capability should be based on C_pk because it considers the upper and lower design specifications separately and not just the overall design specification width.

Given the following process control data for a quality attribute (three samples of size 400 each): -If the process is known to produce 11 percent defectives on average,what is the alpha risk (probability of Type I error)for upper and lower control limits of .1256 and .0944 respectively? .1412 and .0788? .1568 and .0632?

A town's department of public works is concerned about adverse public reaction to a sewer project that is currently in progress.Because of this,the Commissioner of Public Works has authorized a weekly survey to be conducted of town residents.Each week,a sample of 100 residents is questioned on their feelings towards the project.The results to date are shown below.Analyze this data using an appropriate control chart with a 5% risk of Type I error.Is the community sentiment stable?

Construct the appropriate control chart for the sample observations listed below,and determine if the process is in control using two sigma limits.

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

Given the following process control data for a normally distributed quality variable (three samples of size four each): -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?

The frequency and quantity of inspection depends primarily on the cost of inspection.

Using .95 control limits,(5% alpha risk) ,which instructor(s) ,if any,should he conclude is (are) out of control?

What is the estimate of the mean proportion of failures,(p̅) for these instructors?

A control chart used to monitor the fraction of defectives generated by a process is the:

Design specifications are equivalent to control limits.

Control limits and process variability are directly related.