Transcription of Determining Sample Size Page 2
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Determining Sample Size Page 2
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.
of the variability in the population as a whole can be made. Another consideration with sample size is the number needed for the data analysis. If descriptive statistics are to be used, e.g., mean, frequencies, then nearly any sample size will suffice. On the other hand, a good size sample, e.g., 200-500, is needed for
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