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Exam 19: Statistical Process Control and Quality Management

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Question 21

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

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B) False

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Question 22

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Acceptance sampling and control charts may be based on measurements with either ______________ or ___________________.

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variables ...

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Question 23

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Consider a situation where the lower control limit of a percent defective chart is negative. It must be that:

A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. The last 50 sample means are randomly distributed between the upper and lower control limits. The process is:

A major distributor buys shoes from a supplier. The distributor randomly samples the shoes to inspect for quality. The distributor's specifications state that a delivery of 50 pairs of shoes will be accepted only if the number of defective pairs of shoes in a sample of 5 pairs is two or less. Based on the sampling plan, what is the probability of accepting the delivery of 50 pairs of shoes if the actual percent defective is 0.40?

A sampling plan states that if 20 incoming bolts are checked and 2 or less defective bolts are discovered, the lot will be rejected. If an incoming lot is 10 percent defective, what is the probability of rejecting the lot?

The upper and lower control limits are usually set:

A manufacturer of golf club shafts inspects 50 shafts every day. Over the last ten days, the number of defective shafts has been reported to be the following. 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, there can be a total of _____ possible outcomes.

The measurement of color is a(n) _____________.

Mean charts are designed to determine whether a process is in or out of control based on sample means.

Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, ΣX = 15,350 and ΣR = 411.4. To construct a mean chart, what is the value for R bar used to compute the limits?

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 six tubes is taken every three hours and weighed with the following results: What is the range of the samples at 7 am?

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 six tubes is taken every three hours and weighed with the following results: What is the value for the lower control limit (LCL) of the range?

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 lower control limit (LCL) for the mean chart?

A new machine used in the production of motor mount bolts was put into operation. Five samples of size 100 were randomly selected and the number of defectives in each sample was noted. What is the average percent defective?

Pareto charts are based on the 80-20 rule, which says 80% of the factors cause 20% of the problem.

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

If the upper and lower control limits are set at ±3 standard deviations from the mean, we would expect that:

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 six tubes is taken every three hours and weighed with the following results: The measurement of quality is based on: