False Positives and False Negatives (Grade 12 NSC Matric Mathematical Literacy): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
What is a false positive?
What is a false positive?
Test says 'Yes' but reality is 'No'
What is a false negative?
What is a false negative?
Test says 'No' but reality is 'Yes'
If a test is 95% accurate, how often will it give incorrect results?
If a test is 95% accurate, how often will it give incorrect results?
5% of the time (1 in 20 tests)
In a confusion matrix, what is it called when reality is 'No' and the test says 'No'?
In a confusion matrix, what is it called when reality is 'No' and the test says 'No'?
True Negative (correct result)
What is the main consequence of a false positive in medical testing?
What is the main consequence of a false positive in medical testing?
Unnecessary worry and further testing
What is the main risk of a false negative in medical testing?
What is the main risk of a false negative in medical testing?
Missing a condition that needs treatment
In the virus example, what is the probability a person without the virus tests positive?
In the virus example, what is the probability a person without the virus tests positive?
If a test has 5% error rate, what is the probability both the first AND second test are wrong?
If a test has 5% error rate, what is the probability both the first AND second test are wrong?
Why are confirmatory tests used when initial results are positive?
Why are confirmatory tests used when initial results are positive?
To reduce impact of false positives
Why do even small error rates become significant when testing millions of people?
Why do even small error rates become significant when testing millions of people?
Large populations amplify small error rates