Selecting Research Participants

Abstract

OBJECTIVES After 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, stratified , 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 size