A random sample of people is chosen to participate in a survey.
For the survey results to be considered valid, which must be true of the random
sample? (Select all that apply.)

Everyone in the population has an equal chance of being selected in the sample.

The sample must be the same size as the population.

The sample must be a group separate from the population.

The sample size must be small.

The sample must be unbiased.

The sample must be biased.

The sample must represent the target population.