Exam 19: Statistical Process Control and Quality Management

_________ variation is due to slight changes in materials or process conditions and is random in nature.

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

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 for the lower control limit (LCL) of the range chart?

A Pareto chart is useful because it is based on the theory that 80% of the observations are accounted for by 20% of the ________.

The manager of a restaurant measures several variables important to quality. These include food temperature, time to complete an order, and number of times a server visits a table. These variables are graphed over time. Is this an example of acceptance sampling or statistical process control?

A _________ chart portrays the number of defects per unit of production.

In acceptance sampling, the risk of accepting a poor quality lot is known as:

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 0.10?

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 A₂, the control limit factor for averages?

A fishbone diagram is used to determine if a process is out of control.

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 from each bundle to make sure that the napkins are clean with no stains or other defects. By sampling only ten of the napkins, the restaurant may conclude that the all the napkins are clean and use the bundle, even when the napkins are actually dirty and should not be used. This sampling risk is called:

A curve that graphs the percent defective versus the probability of accepting that percent defective is referred to as:

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

Which probability distribution is used to develop a percent defective chart?

In acceptance sampling, if the number of defects in a sample is less or equal to the acceptance number, then the incoming lot is accepted.

A Pareto chart is typically skewed to the ________________.

An airline is investigating the causes of lost bags. The following table of data was collected over the last six months. What is the reason with the highest percentage of bags is lost, and what is the percentage?

The ______ chart portrays the number of defects per unit.

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 lower control limit factor for a range chart?

Which of the following statements about causes of variation are true? I. Assignable variation is random in nature and cannot be eliminated or reduced. II) Chance variation cannot be completely eliminated unless there are significant methods, techniques, or equipment used in the process. III) Chance variation usually cannot be corrected, while assignable variation is correctable.