You tested 150 (value for 'n') children in your pediatric clinic with your new Bordetella pertussis assay. Your test results showed:50 (value for 'a') positive tests among 60 clinical cases of pertussis (60-50=10 [value for 'c']).90 (value for 'd') patients without a cough (no pertussis) tested negative. Determine the sensitivity, specificity, positive predictive value, and negative predictive val