| APPLET | SOURCE | DESCRIPTION |
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| Two sample CI for the difference of means (assuming equal variance) | Dept of Statistics, Texas A&M University | Calculates confidence intervals based on summary statistics for the difference in means with equal variances assumed, nice feature allows a slider to increase or decrease the confidence level one percent at a time. more |
| Two sample CI for the difference of means (not assuming equal variance) | Dept of Statistics, Texas A&M University | Calculates confidence intervals based on summary statistics for the difference in means not assuming equal variances, nice feature allows a slider to increase or decrease the confidence level one percent at a time. more |
| Summary Statistics | Dundee Scientific | Given raw data for two populations, computes confidence intervals for each mean and the difference of means. more |
| Confidence Intervals for Two Populations | A Collection of JavaScript E-labs Learning Objects (Arsham) | Computes confidence interval for the difference in two means for data sets of up to 80 observations each, which must be entered one by one. more |
| Confidence Intervals on the Difference of Two Independent Means | Glass | Computes confidence interval for the difference in two means from summarized data. more |
| t-Test for Independent or Correlated Samples | Vassar Stats (Lowry) | Computes confidence intervals and performs hypothesis tests for the difference in two means from either independent or correlated populations based on data that is either entered or pasted into columns. more
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| Compute CI of a sum, difference, quotient or product | GraphPad QuickCalcs | Calculates 90%, 95% and 99% confidence intervals for the difference in two means (or the sum, ratio or product) based on summary information. more |
| Two sample CI for the difference of proportions (normal approximation) | Dept of Statistics, Texas A&M University | Calculates confidence intervals based on summary statistics for the difference in proportions assuming large samples, nice feature allows a slider to increase or decrease the confidence level one percent at a time. more |