Tim would like area children to participate in his study. To recruit children, he posts flyers
around town and takes any child whose parent responds to the flyer. This method is known
as:
A) simple random sampling. B) nonprobability sampling.
C) stratified random sampling. D) quota sampling.
B
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The most promising development in the treatment of Alzheimer's involves
A) increasing the intake of vitamins and minerals known to enhance memory function. B) vaccines that might clear away any accumulated plaques. C) preventing the degeneration of dopamine-producing cells. D) finding drugs that counteract the processes associated with inheriting high-risk Apo-E allele patterns.
Which of the following factors can affect the outcome of a treatment program?
a. the efficacy of the treatment itself b. regression toward the mean c. placebo effects d. all of these