What is the difference between a probability sample and a nonprobability sample?

What is the difference between a probability sample and a nonprobability sample?



Probability Sampling:


A subset of the population that can be assumed to be a representative cross section of the population because every element in the population has a known non-zero chance of being selected.

Randomization techniques used to draw sample

Allows measurement of random sampling error


Nonprobability Sampling:


A subset of the population in which the chances of selection for the various elements in the population are not precisely known.

No randomization

Sampling error cannot be measured


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