Exam 19: Statistical Process Control and Quality Management

What type of variation can be reduced, or even eliminated, and is usually nonrandom in nature?

The following are examples of attributes: the width of a cracked weld, the length of time that a relay works; the amount of water in a radiator; the diameter of a tire.

The center line of a mean chart is labeled as _______.

Control charts are used to determine if a process is:

An airline is investigating the causes of lost bags. The following table of data was collected over the last six months. What percentage of bags is lost because of "conveyer jams"?

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. What is the mean proportion of defective shafts?

The purpose of a statistical quality control chart is to identify when assignable causes of variation have entered the production system so that the cause may be identified and corrected.

A statistical quality control chart that is out of control shows what a(n) ___________ variation.

What chart helps to identify the relatively few factors that impact the performance of a manufacturing or service process?

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 five sample means show a trend of increasing sample means. The process is:

Another name for the p-bar chart is the ______________.

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.

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 upper control limit (UCL) for the mean?

A diagnostic chart used to identify sources of variation, where the number and types of defects are tallied, is referred to as a(n):

________ causes of variation cannot be entirely eliminated.

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 five sample means show a trend of decreasing sample means. The process is:

Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, How many samples were collected?

A Pareto chart is designed to show the ____________ in which different types of defects occur in a process.

The technique that tallies types of defects and their frequency is called:

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 the center line?