Exam 8: Introduction to Statistical Quality Control

A table of values can be used to help calculate R-chart control limits because the constants have been determined from the sampling distribution of R so that ________.

Control charts were first used by Dr.Walter Shewhart at Bell Laboratories to make a distinction between ________.

The -chart monitors the centering of process output for variables data over time by plotting the ________.

Which of the following are two important tools in helping to achieve process quality?

What is the standard deviation if a proportion of 0.89 of nonconforming items is found from twelve samples of size 136,twelve samples of size 124,and thirty samples of size 131?

An -chart monitors the centering of process output while the R-chart monitors the variability of process output.

The number of nonconforming items in each sample follows ________.

A process is considered out of control when ________.

Find the control limits for the R-chart with = 7 and sample size of 7.

A process is considered to be under control when ________.

Quality control methods help employees do all of the following except ________.

What is the standard deviation if the proportion of nonconforming is obtained to be 0.19 from 100 samples of size 136?

Process capability analysis should be used only after ________.

Process capability analysis involves ________.

When sample points are hugging the center line of a control chart,it usually indicates that the sample data is drawn from two populations.

Identify and explain at least three of the general rules for examining control charts to see if a process is in statistical process control.

For Typhoon Shampoo,the lower specification fill weight is 15.0 ounces and the upper specification fill weight is 15.2 ounces.The filling process has a standard deviation of 0.04 ounces and the process appears to be in control.Find the process capability index.

What is the standard deviation if a proportion of 0.44 of nonconforming items is found from 30 samples of fixed size 110?

What is the standard deviation if the proportion of nonconforming items is 0.34,found from 100 samples of size 215?

The -chart is used to monitor the ________ for variables data over time.