Chance Behavior
Chance behavior is unpredictable in the short run, but has a regular and predictable pattern in the long run.
TThis is defined as its probability. The probability of any outcome is the proportion of times the outcome would occur in a very long series of repetitions.
A random sample of that phenomenon has a probability that represents the probability of a large number of the population or even the entire population from where it was picked.
A study based on random samples from a population would allow inference on what was found on the study of the random samples to be applied to the population from where it was picked.
This is the basis in drawing conclusions in inference statistics