Sociology 3306A/B Lecture 8: soc 3306 ch 6 lectue notes
6 Dec 2016
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Why sample: impossible to observe all relevant events consider heterogeneity, practical considerations require adequate sampling, requires a long time - planning and logistics are more manageable. Population definition: target population population to which the researcher wants to generalize results, two de ning characteristics: geographic and time referrant. Sampling designs: representative provide a close approximation of certain characteristics of a target group, quality of the sample must be judged in terms of the procedure that produced it, in terms of its sampling design. Probability sampling: random selection each element in population has an equal chance of being selected. Thursday, november 10, 2016: 1) complete list of the population. Population subdivided into two or more segments called strata. Simple random samples are then drawn from each stratum to form a complete strati ed sample. Stratifying by variables correlated with the study variable increases the precision of estimates: systematically controls relevant sources of variability.
