"Data from an 8-h work sampling study are shown below.

a. What percentage of the time is the machine running? b. What percentage of the time is the machine broken? c. What is the limit of accuracy of this study for a5 0.05? d. What is the 95 percent confidence interval of the machine running? e. Your manager says that the range in part d is unacceptably large. She would like to narrow the range down to 61 min of running time. How many obser-vations should you collect to achieve this? "

\begin{tabular}{|c|c|c|} \hline Running & \\ \hline \multirow{3}{*}{ Idle } & Broken & \\ \hline & Out of stock & |||||||||| \\ \hline & Other & \\ \hline \end{tabular}