A ratio tends to be a fix number that identifies an amount of one part that makes an amount of a secondary part. Where as a probability can change if the input changes.
Example:
3:5 says that for every 3 parts there will be 5 parts of something else, this ratio cannot change unless we add another factor. However, a probably can change based solely on rolling of a dice again.
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The difference between "at least" and "at most" is not restricted to probability. The difference is simply one between the precise meaning of the phrases in every day English language.
None. The full name is the Probability Distribution Function (pdf).
Proportion is the probability of a selected sample. probability is the true probability of all cases. If this is not what you are looking for then please specify.
They are the same. The full name is the Probability Distribution Function (pdf).
the difference is just that non-probability sampling does not involve random selection, but probability sampling does.