Pretend 1% of the population has a disease. You have a test that determines if you have that disease, but it’s only 80% accurate and 20% of the time you get a false positive. Your test comes back positive. How likely is it you have the disease?

Its can be complicated, becaue if its not 100% accurate, then you may have a hard time testing or knowing if you are sick or not.

Explanation:

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the warning light flashes for a second or two when the engine starts. if it stays on, there's must be something wrong with the coolant. you should never dare to continue driving when the light is on. pull over as soon as possible and shut the engine off.

hope this is what you're talking about