review4ex2 - 031:010 - Research Methods in Psychology...

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031:010 - Research Methods in Psychology Spring, 2010 March 9 th
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Sampling Hierarchy Convenience Sampling - use easily-recruited subjects Probability Sampling - when each person has a definable probability of being sampled simple random sampling - no attempt is made to control the sizes of the groups in the sample stratified random sampling - the sizes of the groups are taken into account proportional - match the sample to population non - proportional mis-match (on purpose) Cluster Sampling - convenient/irrelevant pre-groups 2
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Statistical vs External Validity Statistical Conclusion Validity is the extent to which the inferences made about the sampling population ( using a given sample ) are accurate general rule: you can only apply your results to the people who could have been sampled External Validity is the extent to which the results ( from a given study ) will generalize to other situations note: generalizing outside the range of observed values is extremely dangerous 3
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This note was uploaded on 04/29/2010 for the course PSYCH 002 taught by Professor Freeman during the Spring '08 term at University of Iowa.

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review4ex2 - 031:010 - Research Methods in Psychology...

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