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) none of the above

Question

Quizplus · Accepted Answer

The R-chart is used to monitor the variability or dispersion of a process over time. It plots the range of the sample data over time and signals whether there has been a significant gain or loss in dispersion. Choices B, C, and D are not the usual purpose of an R-chart.

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