(Students Must Compute the Range Per Sample and Overall R-Bar) $\text { Table 1-SPC Problem Data }$

Multiple Choice

(Students must compute the range per sample and overall r-bar)
$\text { Table 1-SPC Problem Data }$
$\text { Observation Number }$
$\begin{array}{|c|r|r|r|r|c|}\hline \text { Sample number } &1&2&3& 4 & 5 \\\hline 1 & 10.1 & 10.6 & 9.8 & 9.9 & 10.9 \\2 & 9.7 & 9.5 & 10.3 & 9.9 & 10.5 \\3 & 10.1 & 10.7 & 9.2 & 10.0 & 10.1 \\4 & 9.9 & 9.8 & 10.5 & 10.4 & 10.1 \\5 & 10.4 & 10.1 & 10.9 & 9.9 & 10.3 \\\hline\end{array}$
-Given the previous results and analysis for the R-chart, one would:

A) conclude that the R-chart is in statistical control, and proceed to develop the x-bar chart.
B) conclude that the R-chart is not in statistical control, and proceed to develop the x-bar chart.
C) investigate sample # 3 as it is outside the R-chart control limits and redo the R-chart.
D) conclude that the variation is not random, and therefore all samples should be investigated.