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1) Scientists have developed aninexpensive new test that can rapidly diagnose COVID-19 infections,a timely advance that comes as clinicians and public healthofficials are scrambling to cope with testing backlogs while thenumber of cases continues to climb. The new test – officially namedthe “SARS-CoV-2 DETECTR” – is easy to implement and to interpret,and requires no specialized equipment, which is likely to make thetest more widely available than the current COVID-19 test kits.

To examine the effectiveness of thenew COVID-19 screening test in County A. Participants were assignedto the new “SARS-CoV-2 DETECTR” screening test or the current test.The three months study period produced these results:

           

		Current test
New test result		Confirmed	Not confirmed	Total
Positive	150	850	1000
Negative	50	19,150	19200
Total	200	20,000	20,200

1. i. Calculate the sensitivity of the “SARS-CoV-2 DETECTR”screening test. (2pts)

ii. Interpret your results(0.5pt):

1. i. Calculate the specificity of the “SARS-CoV-2 DETECTR”screening test. (2pts)

ii. Interpret your results(0.5pt):

1. i. Calculate the predictive value positive of the “SARS-CoV-2DETECTR” screening test. (2pts)

ii. Interpret your results(0.5pt):

1. i. Calculate the predictive value negative of the “SARS-CoV-2DETECTR” screening test.. (2pts)

ii. Interpret your results(0.5pt):