What condition must be met for a sample to count as random?

1. A Option A: At least 100 people must be selected
2. B Option B: Every sub-sample of the population must be represented
3. C Option C: The researcher must pre-test the subjects
4. D Option D: Every member of the population must have an equal chance of being chosen
5. E Option E: A phone book must be used to generate random names

Answer checked 11 October 2026 · How we write and check questions