Chapter 5part2 notes

# Chapter 5part2 notes - Chapter 5 part 2 Review Probability...

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Chapter 5 part 2

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Review Probability = knowing the probability of being selected from the entire population
Nonprobability Samples In many research cases it is impossible or impractical (if not unnecessary) to obtain a probability sample Often probability sampling is abandoned due to practical limitations In nonprobability sample: when researchers have no way of knowing the probability that a particular case will be chosen from the sample

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Nonprobability Samples (cont’d) Not knowing the probability of whether a case will be chosen in the sample Cannot calculate the error of estimation to determine how accurate the sample is This results in a limitation when generalizing the findings
Nonprobability Samples (cont’d) Nonprobability samples often used despite the “genearlizability” problem Most behavioral research does not test the facets of a population, it instead test hypotheses If the data from hypotheses is consistent within the literature then external validation is obtained This is replication If psychological principles are universal then the sample becomes irrelevant

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Nonprobability Samples (cont’d) Three basic types of nonprobability sampling: 1) Convenience Sampling 2) Quota Sampling 3) Purposive Sampling
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