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 Confidence Intervals This site, presented by the Department of Statistics at Yale University, gives an explanation of, a definition for and an example of confidence intervals. It covers topics including inference about population mean and z and t critical values. The page nicely blends graphs and visuals, along with text, to provide a thorough presentation. http://www.stat.yale.edu/Courses/1997-98/101/confint.htm
 P Values and Statistical Significance 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 is a wonderful resource for students wanting to learn more about statistics, and more specially, significant testing. http://www.sportsci.org/resource/stats/pvalues.html
 Student's t-Tests This page gives a short background on Student's t-test and provides three t-test calculators. Two perform t-tests for independent groups and one performs t-tests for matched pairs. Users type in individual data points or copy and paste the entire data set. Some examples are given for demonstration. http://www.physics.csbsju.edu/stats/t-test.html
 Two-Sample t-Test for Equal Means (Engineering Statistics Handbook) Gives textbook-like explanation with some real-life data to compute a t-test and determine if two population means are equal. Also has some links for case studies and a web-based program called Dataplot. There is a printer-friendly version on the main homepage (see source). Overall, this is a great resource for anyone interested in either engineering or mathematics. http://www.itl.nist.gov/div898/handbook/eda/section3/eda353....
 Chi-Square Goodness of Fit Test This site, created by the Department of Statistics at Yale University, gives an explanation, a definition and an example of chi-square goodness of fit test. Topics include chi-square test statistics, tests for discrete and continuous distributions. Overall, this is a great resource for any mathematics classroom studying statistics. http://www.stat.yale.edu/Courses/1997-98/101/chigf.htm
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