False Positives and False Negatives (Grade 12 NSC Matric Mathematical Literacy): Flashcards
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Practise the cards
10 cards from this deck
False positive
False positive
Test says 'Yes' when reality is 'No'
False negative
False negative
Test says 'No' when reality is 'Yes'
Test accuracy
Test accuracy
Percentage of correct results a test produces
Confusion matrix
Confusion matrix
2×2 table showing all possible test outcomes vs reality
True positive in confusion matrix
True positive in confusion matrix
Reality is 'Yes' and test says 'Yes' (correct result)
True negative in confusion matrix
True negative in confusion matrix
Reality is 'No' and test says 'No' (correct result)
95% accurate test means
95% accurate test means
95% correct, 5% wrong (1 in 20 tests will be incorrect)
Why confirmatory testing is used
Why confirmatory testing is used
To reduce impact of false positives from initial tests
Two false positives at 5% error rate probability
Two false positives at 5% error rate probability
False positive consequence in medical testing
False positive consequence in medical testing
Unnecessary worry and further testing required