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A "false positive" has a very specific meaning in Science and in Medicine, that is quite unlike a negative.

Suppose that you are wanting to test whether someone has a specific disease (or if some material has a specific contaminant). The detection test that you use is almost certainly imperfect. It can fail in two ways. The first is failure to detect the disease if someone has it. The second is that the test might indicate that the person has the disease when they really do not.

It is this second sort of failure of the test that is known as a "false positive". It is quite different to a "negative", which would be when the test indicated that the disease was not present, whether correctly or not.

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12y ago

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