| APPLET | SOURCE | DESCRIPTION |
|
| Type I and Type II Errors - Making Mistakes in the Justice System/Errors in Hypothesis Testing Stati | Intuitor.com (Rogers) | Explanation of Type I and Type II errors using Justice system analogy, links to power applet that shows graphically Type I and II errors and power as user changes alternative hypothesis and sample size. more |
| Power applet | Applets for the Cybergnostics Project (West) | Two applets: one allows user to change sample size and generate and view samples to see how power changes with sample size, other allows user to observe how changes in the true mean affect power. more |
| Power Tool | Univ. of Utah, StatCenter Sampler | Visually shows alpha, beta and power for a test of proportion as values for H1 and critical values are changed. more |
| Power, Type I & Type II errors | Java Applets for the Visualization of Statistical Concepts (VESTAC) | For a test for two means, allows user to change the true means, standard deviation, sample size, and significance level to illustrate effects on alpha, Type I and Type II error, or Type II error and power, shown visually. more |
| Repeated Measures | Rice Virtual Lab in Statistics (Lane) | Simulates multiple experiments of a test for two means to observe the t statistics and power or Type I error rate as users vary the number of subjects per sample, population means and standard deviation, and (if applicable) the correlation between the two groups. more |
| Statistical Power Applet | WISE (Web Interface for Statistics Education) | Simulates samples to show the effects of the alternative distribution and sample size on test statistics, p-values, rejection decisions and power of a test for a mean, a demonstration guide is also available. more |
| Hypothesis Tests for a Mean | Prentice-Hall applets (West) | Generates samples to illustrate how test statistics, p-values, actual Type I error rates and power vary for a test for the mean based on user-specified sample size, population shape and parameters, and null mean. more |
| Power Applets, Proportions, Z-test and T-test | Statistical Java (Dorai-Raj, Anderson-Cook, Robinson) | Three applets are similar, simulate 1- or 2-tailed tests for one or two means (using Z or T) or proportions, user can change population parameters, significance level, and mean of alternative distribution to see effects on power (displayed graphically). more |