Ten Samples of N = 5 Were Collected to Construct $\overline { x ^ { * } }$

question 96

Essay

Ten samples of n = 5 were collected to construct an $\overline { x ^ { * } }$ chart. The sample means and ranges are in the table below. Calculate the control limits for the $\overline { x ^ { * } }$ chart and R-chart. After plotting the 10 sample means and ranges on the $\overline { x ^ { * } }$ and R charts, what is your conclusion? Note: You will need a table of control chart factors. $$\begin{array} { | c c c | c c c | } \hline \text { Sample } & \text { Mean } & \text { Range } & \text { Sample } & \text { Mean } & \text { Range } \\\hline 1 & 215 & 15 & 6 & 224 & 21 \\2 & 204 & 20 & 7 & 205 & 27 \\3 & 160 & 10 & 8 & 184 & 12 \\4 & 226 & 19 & 9 & 207 & 16 \\5 & 232 & 24 & 10 & 212 & 17 \\\hline\end{array}$$ $$\begin{array} { c c l c } \hline \text { Subgroup Size } & d _ { 2 } & D _ { 3 } & D _ { 4 } \\\hline 2 & 1.128 & 0 & 3.267 \\3 & 1.693 & 0 & 2.574 \\4 & 2.059 & 0 & 2.282 \\5 & 2.326 & 0 & 2.114 \\6 & 2.534 & 0 & 2.004 \\7 & 2.704 & 0.076 & 1.924 \\8 & 2.847 & 0.136 & 1.864 \\9 & 2.970 & 0.184 & 1.816 \\\hline\end{array}$$

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