07 Sampling Slides

When multiple estimates are required prioritize them

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Unformatted text preview: Sampling Slides 10/23/13 Sample Size for Estimating Proportions z2 n = __ π (1-π) r2 z = z Statistic r = precision desired (H) π = population proportion Heuristics !   When multiple estimates are required, prioritize them in terms of importance for study !   Population size does not influence sample size except in estimating finite population correction factor !   n[N/(N+n-1)] !   Anticipated analysis should also influence sample size Rules !   Must lead to normal distributions !   Depend on population proportions !   The more you know about the population, the less of a sample you will need !   The more certain you want to be, the more of a sample you will need 6...
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