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 Statistics and Data Analysis This online introductory statistics textbook covers basic descriptive, statistical, and graphical procedures for analyzing data sets and contains three data sets and a practice final exam. Chapter headings include: descriptive statistics, probability, resampling, discrete probability models, continuous probability models, central limit theorem, confidence intervals, tests of hypotheses,... http://www.stat.wmich.edu/s160/book/book.html
 Sampling: Statnotes from NCSU's Public Administration Program Sampling is choosing which subjects to measure in a research project. Usually the subjects are people, but subjects could also be organizations, cities, even nations. Measurement is typically accomplished through survey instruments, but could also be by observation, archival record, or other method. Regardless, sampling will determine how much and how well the researcher may generalize his or her... http://faculty.chass.ncsu.edu/garson/PA765/sampling.htm
 The Wilcoxon Matched-Pairs Signed-Ranks Test This site, created by the Universiteit van Amsterdam, allows the user to enter their own data to get results of a Wilcoxon test. The page also provides a brief explanation of how the Wilcoxon test functions. Overall, while this site is quite specific, it still is a valuable resource for those interested in statistics. http://www.fon.hum.uva.nl/Service/Statistics/Signed_Rank_Tes...
 Chi Square This resource, created by author David M. Lane, defines and explains Chi square. It takes the user through 5 different categories: testing differences between p and pi, more than two categories, chi-square test of independence, reporting results, exercises. This basic resource provides students with a much greater understanding of this testing process. Overall, it would be good for any... http://davidmlane.com/hyperstat/chi_square.html
 Nonprobability Sampling 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 purposive methods he describes are: modal instance, expert, quota, heterogeneity, and snowball sampling. Overall, this is a good, albeit brief, overview of the subject of... http://www.socialresearchmethods.net/kb/sampnon.htm
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