Aresearcher posts a radio advertisement offering $35 in exchange for participation in a short study. the researcher accepts the first eight people who respond to the advertisement. which of the following statements is true about the sample? (5 points) a. it is a valid sample because the first eight 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.

The true sentence about the sample is B. It is not a valid sample because it is not a random sample of the population.

Step-by-step explanation:

The concept of random sample involves that the sample have to be representative and with the minimum bias. If the researcher wants to arrive to a conclusion about the population, eight individuals are not enough and he needs a method to select from his subsample (all individuals who respond the advertisement in a given period of time), individuals that will finally participate .

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step-by-step explanation: