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Exam 19: Statistical Process Control and Quality Management

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Question 31

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A c bar chart shows the percent of the production that is defective.

A) True
B) False

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Question 32

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Assignable causes are usually large in number and random in nature, and they cannot be entirely eliminated.

A) True
B) False

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Question 33

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The upper and lower control limits are usually set at

Explain the risks of acceptance sampling.

A statistical quality control chart that is out-of-control shows what type of variation? _______

A manufacturer of golf club shafts inspects fifty shafts every day. Over the last ten days, the number of defective shafts has been reported. To construct a process control chart for the mean percent defective, what is the upper control limit?

The manager of a restaurant inspects a delivery of steaks based on the expectation that each steak weighs eight ounces. Is this an example of acceptance sampling or statistical process control? Explain why.

If the sample ranges fall randomly within the upper and lower control limits, then it can be assumed that the process is ___________.

How is the center line of a mean chart labeled? _______

If a company reports that its quarterly earnings will be between $100 million and $125 million, the range is an example of _________ variation.

A manufacturer of cell phones counts the number of defective phones in an eight hour shift. Over the last ten days, the number of defective shafts per eight hour shift has been reported. To construct a process control chart for the mean number defective, what is the lower control limit?

Control charts can be developed for both variables and attributes.

What process investigates the potential causes of an outcome or effect such as poor quality?

Samples of 200 parts were taken every day and the number of defectives was counted. What are the upper and lower limits for the percent defective chart?

A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then, once the machine is running, a sample of 6 tubes is taken every three hours and weighed with the following results: The measurement of quality is based on

Which probability distribution is used to develop an operating characteristic curve?

What is the purpose of a statistical control chart that plots sample means? _______________________________

A new printing machine is set or calibrated to print 25 copies per minute. On each of four days, the printer's output is measured five times. The data will be used to construct a process control chart to monitor the printing process. The results of the printing process are in the following table. What is the value of the upper control limit factor for a range chart?

A manufacturer of golf club shafts inspects fifty shafts every day. Over the last ten days, the number of defective shafts has been reported. To construct a process control chart for the mean percent defective, what is the lower control limit?

If the binomial distribution is used to develop an operating characteristic curve for an acceptance sampling plan, how many possible outcomes can there be? _______