A new job evaluation screening test is being devised to detect hypothetical problems. One

hundred thirty jobs were selected for screening among which sixty$-$eight jobs were

identified $($known$)$ as $$high risk jobs$($cases$).$ A job evaluation test yielded $50$ positives

$($high risk$),$ of which $30\%$ were true positives.

a$)$ Calculate the sensitivity$,$ specificity, predictive values $(+)$ and $(),$ single

accuracy, double accuracy, and prevalenceof the test. $[$Hint: after setting up the

appropriate $2$x$2$ table, find the missing data by subtraction$]$

b$)$ Would you recommend using this evaluation screening test at this workplace?

Why or why not?