This site, created by author William M.K. Trochim, describes in detail five different types of random sampling. Some of these types include: simple random, stratified random, systematic random, cluster random,...
This site, created by author William M.K. Trochim, explains the 2x2 factorial experimental design, it's components, and it's effects. Employing graphs and illustrations the concepts of the methods are easily understood...
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