An event whose outcome can be determined with certainty. Mathematical laws and many scientific laws are deterministic. Quantum physics, on the other hand, is probabilistic.
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the difference is just that non-probability sampling does not involve random selection, but probability sampling does.
Pros and Cons of a non-probability sampling
(Probability of occurrence) = 1 - (probability of non-occurrence)
Joint probability is the probability that two or more specific outcomes will occur in an event. An example of joint probability would be rolling a 2 and a 5 using two different dice.
Non probability sampling and probability sampling are different because probability sampling uses random samples. Non probability sampling aren't random, but can still be representative of the population as a whole if done correctly.