In a given population, 1000 persons are tested for the presence of a particular disease. Of these, 80 are found to test positive. However, only 40 of these are found on subsequent confirmatory testing to really have the disease. Furthermore, follow-up of the original group of patients reveals that there were 10 people who really had the disease, but were missed by the initial screening test.

i.Find sensitivity, specificity, false negative rate, the false positive rate, predicted value positive, and predicted value negative. ii.What will be the accuracy and precision of the test iii. What will be prevalence of the disease?

iv.For all the calculation write your interpretations

hints:

disease	test positive	test negative
presence	40	10
absence
	80		1000