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Probability is a numerical value defined for a set of outcomes. It is non-negative and such that the sum or integral over all possible outcomes is 1.
A negative z score is a value that is less than the mean value.
positive predictive value and negative predictive value wil not be affected.
Negative z value means that the raw dat is below the mean, if z value is positive it means that the raw data is above the mean.
A probability distribution must have a well defined domain - that is, the set of possible outcomes.For each possible outcome, there must be a non-negative value associated - the probability of that outcome.The sum of the probabilities, over all possible outcomes, must be 1.