Mathematics, 15.10.2019 03:00 mlgrant6121

Aresearcher posts a print 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?

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

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