Mathematics, 21.09.2019 11:20, punani

Aresearcher places a radio advertisement offering $32 in exchange for participation in a short study. the researcher accepts the first nine people who respond to the advertisement. which of the following statements is true about the sample a. it is a valid sample because the first nine people were selected to participate. b. it is not a valid sample because it is not a random sample of the population. 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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Aresearcher places a radio advertisement offering $32 in exchange for participation in a short study...