Which of the Following Is True About a Probability Sample

Multiple Choice

Which of the following is true about a probability sample?

A) The observation method is used to select people who appear most willing to participate.
B) Convenience is the key determinant of who participates.
C) A researcher uses personal judgment to select participants.
D) Every member of the population is included in the sample.
E) Each member of the population has some known chance of being included in the sample.