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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,...
Mean and Median
This applet, created by Rice University's Virtual Lab in Statistics, allows students to manipulate a histogram and observe changes in the mean and median. The site includes links to exercises and descriptions of...
Experimental Design (Industrial DOE)
This site, created by StatSoft, Inc., provides detailed discussions of many different types of experimental designs and examples with tables, graphs, and links to other detailed sites. The page combines text and images...
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...
Types of Surveys
This site, created by author William M.K. Trochim, discusses survey questionnaires and interviews. It also provides links to detailed descriptions and pros and cons of each, and describes how to conduct them. Overall,...
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