The usual purpose of an R-chart is to signal whether there has been a
A) gain or loss in dispersion.
B) change in the percent defective in a sample.
C) change in the central tendency of the process output.
D) change in the number of defects in a sample.
E) change in sample size.

Question

Quizplus · Accepted Answer

An R-chart is used to monitor the variability or dispersion of a process over time. It shows whether there has been a gain or loss in dispersion by plotting the range of each subgroup. This helps in identifying if there is any change in the spread of the process output.

The Usual Purpose of an R-Chart Is to Signal Whether