Professor Murphy wants to set up a control chart to monitor the percentage of absenteeism in his introductory statistics course (50 students are registered). Absences per period for the last 15 class sessions are in the table below. $$\begin{array} { | l | c | c | c | c | c | c | c | c | c | c | c | c | c | c | c | }
\hline \text { Session } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \
\hline \text { Absent } & 5 & 0 & 2 & 2 & 3 & 8 & 10 & 3 & 5 & 5 & 1 & 2 & 0 & 2 & 3 \
\hline
\end{array}$$ Calculate the empirical centerline for a p-chart to track absences.
A).068
B).072
C).146
D).202

Question

Professor Murphy wants to set up a control chart to monitor the percentage of absenteeism in his introductory statistics course (50 students are registered). Absences per period for the last 15 class sessions are in the table below. $$\begin{array} { | l | c | c | c | c | c | c | c | c | c | c | c | c | c | c | c | } 
\hline \text { Session } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \
\hline \text { Absent } & 5 & 0 & 2 & 2 & 3 & 8 & 10 & 3 & 5 & 5 & 1 & 2 & 0 & 2 & 3 \
\hline
\end{array}$$ Calculate the empirical centerline for a p-chart to track absences.
A).068
B).072
C).146
D).202

Quizplus · Accepted Answer

The empirical centerline for a p-chart is calculated by dividing the total number of absences by the total number of observations. In this case, the total number of absences is 50 and the total number of observations is 15, so the empirical centerline is 50/15 = 0.068.

Professor Murphy Wants to Set Up a Control Chart to Monitor