The Chair of the Operations Management Department at Quality University

Multiple Choice

The chair of the operations management department at Quality University wants to construct a p-chart for determining whether the four faculty teaching the basic P/OM course are under control with regard to the number of students who fail the course. Accordingly, he sampled 100 final grades from last year for each instructor, with the following results: $$\begin{array} { l c } \text { Instructor } & \text { Number of Failures } \\\hline \text { Prof. A } & 13 \\\text { Prof. B } & 0 \\\text { Prof. C } & 11 \\\text { Prof. D } & 16\end{array}$$ Using .95 control limits (5 percent risk of Type I error) , which instructor(s) , if any, should he conclude is (are) out of control?

A) none
B) Prof. B
C) Prof. D
D) both Prof. B and Prof. D
E) all