Jacked from researchers at the Univ. of Toronto …
“Although intelligence as measured by IQ tests is important, so is the ability to think rationally about problems.
The surprise is that less intelligent people usually perform just as well as highly intelligent people on problems that test rationality.”
Below is a question to test if you’re a rational (i.e. logical) thinker … or just smart
Question
The XYZ virus causes a disease in one in every 1,000 people.
A test always correctly indicates if a person is infected.
The test has a false-positive rate of five per cent.
In other words, the test wrongly indicates that the XYZ virus is present in five per cent of the cases in which the person does not have the virus.
What is the probability that an individual testing positive actually has the XYZ virus?
Answer
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