Means there was a test done and now it is understood that the test was wrong. i.e. a pregnant woman uses a pregnancy test and it shows up negative then sees her doctor and found out the test was a...
Yes. Both are quite possible.
True, an example of this is 1 - 2 = -1 1 - -------2 is = to -15000 fact
All the answers are false.
Positive = You really did it.False Positive = The test said you did it, but you really did not.