ASSIGNMENT $4$: OPERATIONS MANAGEMENT $2($PRB$260$S$)$

QUESTION $1$

The results of a time study to perform a quality control test are shown in the following table. On the basis of these observations, determine the normal and standard time for the test, assuming a $\backslash (25\backslash \%\backslash )$ allowance factor.

QUESTION $2$

A total of $500$ observations of an assembly$-$line worker, were made over a $40-$hour workweek. The sample also showed that the worker was busy working $($assembling parts$)$ during $400$ observations.

a$.$ Find the percentage of time Bob was NOT working.

b$.$ If you want a confidence level of $\backslash (99\mathrm{.}73\backslash \%\backslash ),$ and if $\backslash (\backslash$pm $2\backslash \%\backslash )$ is an acceptable error, what size should the sample be$?$

c$.$ Was the sample size adequate?