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Exam 10: Quality Control

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Question 31

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The purpose of control charts is to:

A) estimate the proportion of output that is acceptable
B) weed out defective items
C) determine if the output is within tolerances/specifications
D) distinguish between random variation and assignable variation in the process
E) provide meaningful work for quality inspectors

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

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Question 32

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What is the sample proportion of defectives for sample #1? #2? #3?

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Question 33

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The Taguchi Cost Function suggests that the capability ratio can be improved by extending the spread between LCL and UCL.

Construct the appropriate two-sigma control chart for the sample observations listed below.

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

Range charts and p-charts are both used for variable data.

What is the estimate of the sample average range based upon this limited sample?

Statistical Process Control is the measurement of rejects in the final product.

If the process proportion of defectives is unknown, what is the estimate of it?

If the process proportion of defectives is unknown, using .10 alpha risk control limits, do any of the sample proportions indicate an out-of-control process proportion of defectives?

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

A lower control limit must by definition be a value less than an upper control limit.

An operator collected the following time series data from a process:

The number of runs with respect to the sample median is:

The amount of inspection needed is governed by the costs of inspection and the expected costs of passing defective items.

Tolerances represent the control limits we use on the charts.

The number of runs with respect to the sample median is:

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 control charts that would provide for a 5% risk of Type I error.

Control limits used on process control charts are specifications established by design or customers.

What is the sample mean service life for sample 2?