 |  How to Design and Evaluate Research in Education, 5/e Jack R. Fraenkel,
San Francisco State University
Norman E. Wallen,
San Francisco State University
Sampling
Learning ObjectivesStudying this chapter should enable you to:
| Distinguish between a sample and a population |
| | | | Explain what is meant by the term "representative sample" |
| | | | Explain how a target population differs from an accessible population |
| | | | Explain what is meant by "random" sampling and describe briefly three ways of obtaining a random sample |
| | | | Use a table of random numbers to select a random sample from a population |
| | | | Explain what is meant by systematic sampling, convenience sampling, and purposive sampling |
| | | | Explain how the size of a sample can make a difference in terms of representativeness of the sample |
| | | | Explain what is meant by the term "external validity" |
| | | | Distinguish between population generalizability and ecological generalizability and discuss when it is (and when it is not) appropriate to generalize the results of a study |
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2003 McGraw-Hill Higher Education