These applets, presented by Virginia Tech's Department of Statistics, address the notion of "power." Users can perform one or two tailed tests for proportions or means for one or two samples. Set the parameters and...
This worksheet, created by Beth Chance and Allan Rossman, provides students with four exercises in designing a case study. Each exercise presents a difference scenario and asks a series of questions about study design....
This site, created by author William M.K. Trochim, describes numerous methods of nonprobability sampling, including accidental, haphazard or convenience sampling and many other types of purposive methods. Some of these...
This resource, created by authors James Filliben and Alan Heckert, provides an explanation of scatter plots, their use, purpose and interpretation. It uses examples of the various relationships described by scatter...
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