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  • Shannon's Experiment to Calculate the Entropy of English

    The following applet allows you to simulate the Shannon experiment, an experiment aimed at determining the entropy of an English letter (the amount of information in bits that we obtain on the average when we learn one letter of English). The simulation will calculate the amount of entropy for you when you are finished guessing the letters.

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  • Breaking The Vigenere Encryption System

    This applet is programmed to illustrate the code-breaking process using the Vigenere encryption as the code. The Vigenere encryption is broken by comparing histograms of various frequencies until the correct guess is obtained. A wrong guess for the period p leads to relatively flat histograms. The code breaker in this case repeats the analysis with a new trial period.

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  • Breaking The Rectangular Transposition Encryption System

    This applet illustrates the codebreaking process entitled Rectangular Transposition Encryption System.

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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.

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  • 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.

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  • Stem and Leaf Plot

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

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  • Histogram

    This site gives a definition and an example of histograms.

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  • Inference in Linear Regression

    This site gives an explanation, a definition and an example of inference in linear regression. Topics include confidence intervals for intercept and slope, significance tests, mean response, and prediction intervals.

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  • Statistics Glossary v1.1

    This site is a glossary of statisical terms searchable by topic or in alphabetical order. Topics include: Basic Definitions, Presenting Data, Sampling, Probability, Confidence Intervals, Hypothesis Testing, Paired Data, Correlation and Regression, Design of Experiments and ANOVA, Categorical Data, Non-parametric Methods, and Time Series Data.

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  • Foundations

    This online, interactive lesson on foundations provides examples, exercises, and applets which review the algebra of sets and functions, general relations with special emphasis on equivalence relations and partial orders, and some basic combinatorial structures such as permuations and combinations.

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