This resource, created by author Will G. Hopkins, defines what a p-value is, why .05 is significant, and when to use it. It also covers related topics such as one-tailed/two-tailed tests and hypothesis testing. Overall...
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...
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...
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