1. The sampling frame is arguably the most critical element of a study’s sampling plan. Why is this so?
2. How might a poorly specified sampling frame forestall the research process?
3. Are studies that employ convenience sampling invalid? Please explain.
4. Of the sampling methods presented in this module, which optimize external validity (if this term is unfamiliar, revisit the Module 2 home page)? Please explain.
available on the internet:
Trochim, W.M.K. (2006). Sampling terminology. Retrieved from http://www.socialresearchmethods.net/kb/sampterm.php Retrieved February 23, 2012
http://search.proquest.com/docview/220293793?accountid=28844
External Validity (Generalizability): Truth beyond a study. A study is external valid if the study conclusions represent the truth for the population to which the results will be applied because both the study population and the reader’s population are similar enough in important characteristics. The important characteristics are those that would be expected to have an impact on a study’s results if they were different (e.g., age, previous disease history, disease severity, nutritional status, co-morbidity, …). Whether or not the study is generalizable to the population of interest to the reader is a question only the reader can answer.
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