Exam 19: Statistical Process Control and Quality Management

A large restaurant contracts with a local laundry to wash white napkins. The laundry returns the napkins in bundles of 100 napkins. The restaurant uses a sampling plan to make a decision to use the bundle of napkins or return the bundle to the laundry. The sampling plan uses a sample size of ten with a "number of rejects allowed" of one. If the number of dirty napkins in a sample of ten is two, what decision is made?

What is usually developed to evaluate a sampling plan?

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 100 pairs of shoes will be accepted only if the number of defective pairs of shoes in a sample of 10 pairs is two or less. Based on the sampling plan, what is the probability of accepting the delivery of 100 pairs of shoes if the actual percent defective is 0.00?

In a control chart, expected variation is defined by the:

A large restaurant contracts with a local laundry to wash white napkins. The laundry returns the napkins in bundles of one-hundred napkins. The restaurant randomly samples ten napkins to make sure that the napkins are clean with no stains or other defects. The restaurant is using a method called:

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 4 pm?

Percent defective charts, which are also known as p-charts or c-bar charts, show the percent of the production that is or is not acceptable.

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 mean for Day 1?

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. To construct a range process control chart, what is the mean range?

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 lower control limit (LCL)?

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 X-bar for 7 am?

A fishbone diagram is an ________________ tool.

A subassembly is inspected and the number of defects recorded. A new group of assemblers began work Monday morning. The number of defects per subassembly for the first 10 they produced was: 3, 2, 0, 5, 4, 6, 0, 7, 7, and 6. What are the upper and lower limits for the c-bar chart?

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 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 100 pairs of shoes will be accepted only if the number of defective pairs of shoes in a sample of 10 pairs is two or less. Based on the sampling plan, what is the probability of accepting the delivery of 100 pairs of shoes if the actual percent defective is 0.50?

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 100 pairs of shoes will be accepted only if the number of defective pairs of shoes in a sample of 10 pairs is two or less. Based on the sampling plan, what is the probability of accepting the delivery of 100 pairs of shoes if the actual percent defective is 0.80?

A fishbone diagram starts with the definition of a problem and explores its possible ________.

In an acceptance sampling plan, the incoming lot is ___________ if the number of defective items in the sample is less than or equal to the acceptance number.

If a company reports that its quarterly earnings will be between $100 million and $125 million depending on the consumer demand, consumer demand is an example of ________ variation.

Over the last ten days, a manufacturer of cell phones counts the number of defective phones created in each eight-hour shift. The results are shown next. What is the average number of defective phones per eight-hour shift?