<prompt> On a screening test, negative result is seen in 50 of non- diseased population and positive result in 10 healthy population. Calculate specificity:0.50.60.830.9  <response>: Ans. c 0.83Ref: K. Park 21sted. 113 The screening test shows true negative result in 50 of diseased population In 10 healthy population, the test shows positive result. That means 10 false positive.Putting this into formula:True Negative---False positive True Negativex 100 50---10 50x 100 50---60x 100 83 0.83 