A Town's Department of Public Works Is Concerned About Adverse

Essay

A town's department of public works is concerned about adverse public reaction to a sewer project that is currently in progress. Because of this, the commissioner of public works has authorized a weekly survey to be conducted of town residents. Each week, a sample of 100 residents is questioned on their feelings about the project. The results to date are shown below. Analyze these data using control charts that would provide for a 5 percent risk of Type I error. $$\begin{array} { l r r r r r r r r } \text { Week } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\\hline \text { Number Opposed } & 10 & 8 & 12 & 6 & 4 & 14 & 8 & 10\end{array}$$