Question

A researcher posts a newspaper advertisement offering $20 in exchange for participation in a short study. The researcher accepts the first five people who respond to the advertisement. Which of the following statements is true about the sample?

A It is not a valid sample because it is only a short study.
B It is a valid sample because money was offered to participants.
C It is a valid sample because the first five people were selected to participate.
D It is not a valid sample because it is not a random sample of the population.

Answer 1

The answer is D, "It is not a valid sample because it is not a random sample of the population."

Answer 2

I believe its c if not them it has to be d