The Distinguishing Feature of Probability Samples Is That

Multiple Choice

The distinguishing feature of probability samples is that

A) they involve personal judgment somewhere in the selection of sample elements.
B) each population element has an equal chance of being included in the sample.
C) each population element has an equal chance of being included in the sample and every combination of n population elements is a sample possibility.
D) each population element has a known chance of being included in the sample.
E) they will always be more representative of the population than nonprobability samples.