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• Breaking A Monoalphabetic Encryption System Using a Known Plaintext Attack

This applet illustrates the codebreaking process using a chi-squared process.
• International Statistical Institute Glossary of Statistical Terms

This site shows the ISI's alphabetical list of technical terms in statistics showing the translation in a number of languages.
• Yale Statistical Topics

This site provides definitions and examples for the following topics: Graphical displays (stemplots, histograms, boxplots, scatterplots), Numerical Summaries (mean, median, quantiles, variance, standard deviation), Normal Distributions (assessing normality, normal probability plots), Categorical Data (two-way tables, bar graphs, segmented bar graphs), Linear regression (least-squares, residuals, outliers and influential observations, extrapolation), Correlation (correlation coefficient, rŒ_), Inference in Linear Regression (confidence intervals for intercept and slope, significance tests, mean response and prediction intervals), Multiple Linear Regression (confidence intervals, tests of significance, squared multiple correlation), ANOVA for Regression (analysis of variance calculations for simple and multiple regression, F statistics), Experimental Design (experimentation, control, randomization, replication), Sampling (simple, stratified, and multistage random sampling), Sampling in Statistical Inference (sampling distributions, bias, variability), Probability Models (components of probability models, basic rules of probability), Conditional Probability (probabilities of intersections of events, Bayes' formula), Random variables (discrete, continuous, density function), Mean and Variance of Random Variables (definitions, properties), Binomial Distributions (counts, proportions, normal approximation), Sample Means (mean, variance, distribution, Central Limit Theorem), Confidence Intervals (inference about population mean, z and t critical values), Tests of Significance (null and alternative hypotheses for population mean, one-sided and two-sided z and t tests, levels of significance, matched pairs analysis), Comparison of Two Means (confidence intervals and significance tests, z and t statistics, pooled t procedures), Inference for Categorical Data (confidence intervals and significance tests for a single proportion, comparison of two proportions), Chi-square Goodness of Fit Test (chi-square test statistics, tests for discrete and continuous distributions), Two-Way tables and the Chi-Square test (categorical data analysis for two variables, tests of association).
• Stem and Leaf Plot

This site gives a definition and an example of stem and leaf plots.
• Histogram

This site gives a definition and an example of histograms.
• Boxplot

This site give a definition and an example of boxplots. Topics include outliers, medians, as well as lower and upper quartiles.
• Scatterplot

This site gives a definition and an example of scatterplots. Topics include positive and negative association.
• Numerical Summaries

This site gives a definition and an example of numerical summaries. Topics include mean, median, quantiles, variance, and standard deviation.
• Normal Distributions

This site gives a definition and an example of normal distributions. Topics include assessing normality and normal probability plots.
• Categorical Data

This site gives a definition and an example of categorical data. Topics include two-way tables, bar graphs, and segmented bar graphs.