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10 cards from this deck
Test says 'Yes' when reality is 'No'
Test says 'No' when reality is 'Yes'
Percentage of correct results a test produces
2×2 table showing all possible test outcomes vs reality
Reality is 'Yes' and test says 'Yes' (correct result)
Reality is 'No' and test says 'No' (correct result)
95% correct, 5% wrong (1 in 20 tests will be incorrect)
To reduce impact of false positives from initial tests
0.05×0.05=0.0025=0.25%0.05 \times 0.05 = 0.0025 = 0.25\%0.05×0.05=0.0025=0.25%
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