Transcription of Determining Sample Size Page 2 - Tarleton
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Determining Sample Size Page 2 - Tarleton
Determining Sample SizePage 2 Figure of Means for Of VariabilityThe third criterion, thedegree of variabilityin theattributes being measured refers to the distribution ofattributes in the population . The more heterogeneousa population , the larger the Sample size required toobtain a given level of precision. The less variable(more homogeneous) a population , the smaller thesample size . Note that a proportion of 50% indicatesa greater level of variability than either 20% or 80%.This is because 20% and 80% indicate that a largemajority do not or do, respectively, have the attributeof interest. Because a proportion of .5 indicates themaximum variability in a population , it is often usedin Determining a more conservative Sample size , thatis, the Sample size may be larger than if the truevariability of the population attribute were FOR DETERMININGSAMPLE SIZET here are several approaches to Determining thesample size .
If the population is small then the sample size can be reduced slightly. This is because a given sample size provides proportionately more information for a small population than for a large population. The sample size (n 0) can be adjusted using Equation 3. Where n is the sample size and N is the population size.
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