You&#x27;re assuming people know what the test results mean. Every time we ask people what the tests mean we find they don&#x27;t know.<p>Gerd Gigerenzer (<i>Reckoning with risk</i>) shows that doctors, nurses, and patients don&#x27;t understand the results of screening tests.<p>Here&#x27;s another example: <a href="https:&#x2F;&#x2F;www.sciencenews.org&#x2F;blog&#x2F;context&#x2F;doctors-flunk-quiz-screening-test-math" rel="nofollow">https:&#x2F;&#x2F;www.sciencenews.org&#x2F;blog&#x2F;context&#x2F;doctors-flunk-quiz-...</a>