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 tool lets you calculate the probability that a random variable X is in a specified range, for a variety of probability distributions for X: the normal distribution, the binomial distribution with parameters n and p,...

This page, created by Virginia Tech's Department of Statistics, provides users with a myriad of different applets presenting different probability distributions. Some of these include: binomial, Poisson, negative...

This compendium, created by Dr. Michael P. McLaughlin, describes distributions appropriate for the modeling of random data. The number of distributions, fifty-six, is large, including: continuous distributions (30),...

This tutorial on the "One Sample t-Test" includes its definition, assumptions, hypotheses, and results. An example using output from the WINKS software is given, but those without the software can still use the...