Mathematics, 25.12.2019 14:31 alysiareyes

Aresearcher posts a magazine advertisement offering $30 in exchange for participation in a short study. the researcher accepts the first three 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 not a random sample of the population.
b. it is a valid sample because the first three people were selected to participate. c. it is a valid sample because money was offered to participants.
d. it is not a valid sample because it is only a short study.

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