Exam 19: Statistical Process Control and Quality Management

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 pm?

The upper and lower control limits are usually set ________.

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 LCL for the mean?

A new machine that fills tubes of toothpaste will be monitored using statistical process control. The following data were collected while the machine was closely monitored and under control. Each day a random sample of six tubes are weighed. Based on the data,the process mean is 6.752. What is the lower control limit for the x-bar chart rounded to three decimal places?

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

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. The measurement of quality is based on ________.

In acceptance sampling,usually 100% of the incoming lot is checked.

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

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 The measurement of quality is based on ________.

A chart used to show the results of a Pareto analysis is a ________.

Control charts can be developed for both variables and attributes.

A fishbone diagram classifies potential causes into categories. What are they?

Assignable causes are usually large in number and random in nature,and they 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 ________.

There are two general types of causes of variations in manufacturing and service processes: chance and assignable causes.

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 upper control limit for the mean?

Quality control charts indicate whether a production process is in control or out of control.

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 ________.

Equipment failure would be an example of ________ variation.

The cause-and-effect chart is an example of a ________.