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 HyperStat Online: Power This site, created by author David M. Lane of HyperStat Online, defines power and explains what factors may affect it, such as significance level, sample size and variance. In addition, their is an activity allowing students to estimate the power they want to use in a given experiment. Finally, their is an eight question set of exercises which allows the student to apply the knowledge gained from... http://davidmlane.com/hyperstat/power.html
 WINKS Statistics Tutorials: Interpreting Statistical p-values This page, created by WINKS Statistics Tutorials, discusses the understanding of and interpretation of p-values for those who read articles with statistical information. The page provides an introduction to much of the statistical jargon used in scientific journals, studies, etc. While simplistic, it is a nice overview and provides answers to many basic questions needing to be answered to best... http://www.stattutorials.com/p-value-interpreting.html
 Estimating the Population Value of rho on the Basis of Several Observed Sample Values of r This page will perform the procedure for up to k=12 sample values of r, with a minimum of k=2. It will also perform a chi-square test for the homogeneity of the k values of r, with df=k-1. The several values of r can be regarded as coming from the same population only if the observed chi-square value proves the be non-significant. http://faculty.vassar.edu/lowry/rhopop.html
 Confidence Intervals & Hypothesis Testing This site, authored by David M. Lane of HyperStat Online, explains the relationship between hypothesis testing and confidence intervals. Because of the immense similarities between the two procedures many find them to be one in the same. Lane attempts to dispel this common misconception with his brief presentation on the subject. http://davidmlane.com/hyperstat/B15183.html
 HyperStat Online: Confidence Intervals This resource gives a thorough definition of confidence intervals. It shows the user how to compute a confidence interval and how to interpret them. It goes into detail on how to construct a confidence interval for the difference between means, correlations, and proportions. It also gives a detailed explanation of Pearson's correlation. It also includes exercises for the user. http://davidmlane.com/hyperstat/confidence_intervals.html
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