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Selecting Research Participants

125 CHAPTER 6 Selecting Research ParticipantsOBJECTIVESA fter studying this chapter, students should be able to Define the term sampling frame Describe the difference between random sampling and random assignment Define the term probability sampling Describe the difference between random, systematic, strat-ified, cluster, and multistage sampling Define the term nonprobability sampling Describe the difference between convenience, quota, and referral sampling Determine the best sampling method for a given Research problem Describe the relationship between sample size and effect size Describe the relationship between statistical power and sample sizeHave you ever received a phone call from someone who works for some Research insti-tute and wants a few minutes of your time?

agencies when they conduct a census. We all know that only the government can afford to measure the entire population. The rest of us conduct our research on some sample from a population. We then use inferential statistics to make statements about the population based on the findings from our sample.

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