CRCJ 3001 Chapter Notes - Chapter 5: Convenience Sampling, Nonprobability Sampling, Stratified Sampling
3 Oct 2018
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Systematic sampling: systematic sampling: sample obtained by selecting every nth participant from a list containing the total pop after a random starting point, size of n: pop size/desired sample size, ex. Pop of 100 children & desired sample size of 25: n = 4 (every fourth individual: less random bc. principle of independence violated, ensures high degree of representativeness. Stratified random sampling: stratified random sampling: identifying specific subgroups to be included in the sample & then selecting equal-sized random samples from each pre-identified subgroup, ex. Taking stratified random sample of 50 ppl (25m25f) from a pop of. 50m250f = m&f not equal in pop: every individual in the pop have equal chance of being selected, ex. Probability of selecting m: 1/2; probability of selecting f: 1/10. Convenience sampling: convenience sampling: selection of individuals on basis of their availability & willingness to respond, ex.
