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 .
Determining Sample Size Page 4 Suppose our evaluation of farmers’ adoption of the new practice only affected 2,000 farmers. The sample size that would now be necessary is shown in Equation 4. As you can see, this adjustment (called the finite population correction) can substantially reduce the necessary sample size for small populations.
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