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An x$-$bar control chart was examined and no data points fell outside of the limits$.$ Can this process be considered in control?

Select one:

a$.$ Not yet, the R$-$chart must be checked.

b$.$ Not yet, the number of samples must be known.

c$.$ Not yet, there could be a pattern to the points.

d$.$ Both Not yet, there could be a pattern to the points and Not yet, the $R-$chart must be checked

e$.$ Yes.