Measures of Location

Random Number Generator

As quoted on the site, "This website ... offers the possibility to download true random numbers generated using a quantum random number generator upon demand. Users can specify the length of the random number sequence and their upper boundary."

http://www.randomnumbers.info/

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Linear Regression Calculator

This is a virtual linear regression calculator. It allows students to enter data points, experiment with where the line of best fit might be, and then lets them see the correct line of best fit as well as the outliers. You can click through the introduction.

http://www.roundworldmedia.com/linear/linear.html

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Games of Chance

This online, interactive lesson on games of chance provides examples, exercises, and applets which include Poker, Poker dice, Chuck-a-Luck, Craps, Roulette, The Monty Hall Problem, lotteries, and Red and Black.

http://www.math.uah.edu/stat/games/

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Introduction to Statistics: Mean, Median, and Mode

The goal of this lesson is to introduce the concepts of mean, median and mode and to develop understanding and familiarity with these ideas. The activity lets students explore mean and median in an efficient way and the discussion helps them to formalize their knowledge of measures of center.

http://www.shodor.org/interactivate/lessons/sm1.html

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Sampling Distribution Generator for r (correlation coefficient)

This page generates a graph of the sampling distribution of r, the Pearson correlation coefficient. Upon opening, the applet prompts for sample size greater than 6. The applet also displays the probabilities associated with the distribution.

http://faculty.vassar.edu/lowry/rsamp.html

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Hypothesis Testing

The seventh chapter of an online Introduction to Biostatistics course. Two sets of lecture notes are provided (only the first one works). Additionally, links for additional reading and exercises with solutions are provided.

http://www-unix.oit.umass.edu/~biep540w/webpages/testing.htm

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Likelihood Ratio Test

This site focuses on using the LRT to compare two competing models.

http://workshop.molecularevolution.org/software/phylogenetics/garli

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Log-likelihood ratio

This site offers an involved definition of the likelihood ratio test with examples and formulas.

http://encyclopedia.thefreedictionary.com/Log-likelihood%20ratio

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The Beta Distribution

This applet allows the user to adjust a (1st shape) and b (2nd shape) parmaters of the Beta distribution with a slider or manual input. The applet allows the user to fix the x and or y axes. The user immediately sees how this affects the the shape of the graph as well as the variance and the expected value. This page was formerly located at http://www.stat.vt.edu/~sundar/java/applets/BetaDensityApplet.html

http://www.causeweb.org/repository/statjava/BetaDensityApplet.html

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Basic Sample Stats Calculator

The page calculates summary statistics for any dataset. Users will be prompted for sample size when opening this page. The calculator returns mean, sum of X, sum of X^2, variance, standard deviation, and standard error. Key word: Descriptive statistics.

http://faculty.vassar.edu/lowry/basic.html

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