sampling - 031:010 - Research Methods in Psychology Spring,...

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031:010 - Research Methods in Psychology Spring, 2010 Feb 16 th 1
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Sampling a general rule (with regard to external validity): you can only apply your results to the people who could have been sampled External Validity : the extent to which the results ( from a study ) will generalize to other situations ( i.e., other people, places, and times ) 2
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Sampling Convenience Sampling use easily-recruited subjects ( e.g., street; Elem Pool ) Probability Sampling when each person in the population has a definable probability of being sampled why this matters: populations often have sub-populations (groups) within them (e.g., divide pop. by sex, race, etc) to whom your results apply depends on who could have been sampled 3
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Sampling two ( main ) versions of Probability Sampling 1) simple random sampling no attempt is made to ensure that the sizes of the groups in the sample match those in the pop. -
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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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sampling - 031:010 - Research Methods in Psychology Spring,...

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