Sample size formulas cannot be used for nonprobability samplesDetermining the sample size is a subjective, intuitive judgment We also cannot estimate sampling error!Rules of thumb / heuristics Budget Client desires Expert judgmentSampling Plan The blueprint or framework needed to ensure that the data collected are representative of the defined target populationSample size formulas cannot be used for nonprobability samples. Determining the samplesize for nonprobability samples is usually a subjective, intuitive judgment made by theresearcher based on either past studies, industry standards, or the amount of resourcesavailable. Regardless of the method, the sampling results cannot be used to make sta-tistical inferences about the true population parameters. Researchers can compare spe-cific characteristics of the sample, such as age, income, and education, and note that thesample is similar to the population. But the best that can be offered is a description of thesample findings.
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