Random Samples
Random Samples of 200 Parts Were Taken on an Assembly

question 130

Essay

Random samples
Random samples of 200 parts were taken on an assembly line every hour for the past 25 hours. The number of defective parts is shown in the accompanying table.
$$\begin{array}{l}\begin{array} { | l | l l l l l l l l l l l l l | } \hline \text { Sample } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 \\\hline \begin{array} { l } \text { Number of } \\\text { defectives }\end{array} & 5 & 2 & 4 & 10 & 2 & 6 & 8 & 2 & 0 & 5 & 12 & 11 & 8 \\\hline\end{array}\\\\\begin{array} { | l | c c c c c c c c c c c c | } \hline \text { Sample } & 14 & 15 & 16 & 17 & 18 & 19 & 20 & 21 & 22 & 23 & 24 & 25 \\\hline \begin{array} { l } \text { Number of } \\\text { defectives }\end{array} & 10 & 5 & 13 & 7 & 5 & 7 & 11 & 3 & 16 & 3 & 2 & 10 \\\hline\end{array}\end{array}$$
-Construct the p chart and determine if the production process is under control.