Assertion: r chart | /r/HasProperty | examined before chart
Facets:
Source sentences:
text: Thus, the R chart is examined before the x ¯ {\displaystyle {\bar {x}}} chart; if the R chart indicates the sample variability is in statistical control, then the x ¯ {\displaystyle {\bar {x}}} chart is examined to determine if the sample mean is also in statistical control.