HEATKEYS

Statistical resources for social scientists, including Z-test, Chi-square & T-test statistical calculators.

DanielSoper.com - The homepage of Daniel Soper

Online tools and calculators for biology, bioinformatics, statistics, and medical statistics.

Free Online Math Calculators and Converters. Mathematics Calculation is made easier.

GraphPad Prism is a powerful combination of biostatistics, curve fitting (nonlinear regression) and scientific graphing in one comprehensive program. Easily organize, analyze and graph repeated experiments; pick appropriate statistical tests and inte...

DataStar is a leading provider of survey management and data processing services, specializing in web surveys for employee and customer feedback.

Survey software for online surveys, paper surveys, and interviewing. Outstanding crosstab tables and statistical analysis. Survey software and Web survey software for marketing research, public opinion polls, customer satisfaction, and program evalua...

A free online t-test calculator. Statsisitcs calculator computes p values for 1-tailed or 2-tailed t-tests. Performs the t-test for groups with equal variance, unequal variance, and matched groups (paired groups).

User-friendly introduction to statistics, probability, and survey sampling. Free, online tutorials - a general statistics tutorial and a tutorial tailored to the Advanced Placement (AP) Statistics curriculum. Online tools - statistical tables, probab...

Web site for statistical computation; probability; linear correlation and regression; chi-square; t-procedures; t-tests; analysis of variance; ANOVA; analysis of covariance; ANCOVA; parametric; nonparametric; binomial; normal distribution; Poisson di...