| APPLET | SOURCE | DESCRIPTION |
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| Group Differences Menu, Paired difference or Paired t test | Dept. of Obstetrics and Gynaecology, Chinese Univ. of Hong Kong, Statistical Toolbox | Paired difference conducts paired t-test for raw data pasted in or entered in pairs, Paired t test uses summarized data. more |
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| t-test: Independent Groups | Vadum, Rankin: Psyschological Research Statistical Applets (Rankin) | Calculates test statistic and 1-tailed and 2-tailed p-values for a independent samples t-test. more |
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| t test calculator | GraphPad, QuickCalcs | Conducts either paired or independent t test for sample sizes up to 50 (for data entered manually) or up to 2000 (for data pasted in), or based on summary statistics, produces 2-tailed p-value with interpretation and confidence interval for difference. more |
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| Student’s t-Tests | Statistics to Use (Kirkman) | Conducts tests on paired samples (entered one by one) or independent samples (pasted or entered in), provides descriptive statistics and confidence intervals for each sample and difference. more |
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| The Significance of the Difference Between Two Independent Proportions | Vassar Stats (Lowry) | Computes 1- and 2-tailed p-values for a hypothesis test for independent proportions based on summary data. more |
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| Comparison of Two Proportions | A Calculating Companion for Brunett’s Critical Thinking | Provides p-value for a test of equality of two proportions based on summary data, also provides Yates correction p-value. more |
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| The Before-and-After Test for Proportions | A Collection of JavaScript E-labs Learning Objects (Arsham) | Tests 2-tailed hypothesis about paired proportions based on two entered sample proportions and sample size and provides interpretation of p-value. more |
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