Free Software for Statistical Hypothesis Tests (Calculators):

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Univariate Statistical Hypothesis Testing - Ungrouped Data
Skewness/Kurtosis TestD'Agostino skewness test, Anscombe-Glynn kurtosis test, Jarque-Bera Normality Test (against normality).
Skewness-Kurtosis PlotSkewness-Kurtosis plot as proposed by Cullen and Frey (1999).
Testing Mean (unknown Variance) - p-valuecomputes the 2-sided p-value for the statistical hypothesis test about the mean when the population variance is unknown. This test can be applied to any univariate dataset.
Testing Mean (known Variance) - Critical Valuecomputes the critical value for one- and two-sided hypothesis tests about the mean. In this test it is assumed that the population variance is known.
Testing Mean (known Variance) - p-valuecomputes the p-value for one- and two-sided hypothesis tests about the mean. In this test it is assumed that the population variance is known.
Testing Mean (known Variance) - Type II Errorcomputes the Type II Error for the one-sided hypothesis test about the mean. In this test it is assumed that the population variance is known.
Testing Mean (known Variance) - sample sizecomputes the sample size for the one-sided hypothesis test about the mean, given a user-defined type I and II error. In this test it is assumed that the population variance is known.
Testing Population Mean with known Variance - Confidence Intervalcomputes the confidence intervals for the one-sided and two-sided hypothesis test about the population mean
Testing Sample Mean with known Variance - Confidence Intervalcomputes the confidence intervals for the one-sided and two-sided hypothesis test about the sample mean
Testing Variance - Critical Value (Region)computes the critical value (region) for the hypothesis test about the variance
Testing Variance - p-value (probability)computes the p-value (probability) for the hypothesis test about the variance
Testing Variance - Confidence Intervals for Sample Variancecomputes the confidence intervals for the one-sided and two-sided hypothesis test about the sample variance
Testing Variance - Confidence Intervals for Population Variancecomputes the confidence intervals for the one-sided and two-sided hypothesis test about the population variance
Testing Mean with unknown Variance - Critical Valuecomputes the 2-sided and 1-sided confidence intervals for the statistical hypothesis test about the mean when the population variance is unknown. This test can be applied to any univariate dataset.
Testing Population Proportion - Critical Valuecomputes the critical values for one- and two-sided hypothesis tests about the population proportion.
Testing Population Proportion - P-Valuecomputes the p-value of the population proportion test.

Bivariate and Multivariate Statistical Hypothesis Testing - Ungrouped Data
Two Sample Tests about the MeanPaired and Unpaired Two Sample Tests about the Mean (paired t-test, unpaired t-test, Welch t-test, and Wilcoxon rank sum test with continuity correction).
Kendall tau Correlation MatrixMultivariate correlation plot based on Kendall tau rank correlations and their respective p-values.
Notched BoxplotsNotched Boxplots for a multivariate dataset.
1-way ANOVASingle Factor Analysis of Variance.
2-way ANOVATwo Factor Analysis of Variance.
Chi-Squared TestsThis module computes the Pearson Chi-Squared test, Exact Pearson Chi-Squared by Simulation test, McNemar test, and the Association Plot.
Compare CorrelationsThis module tests the difference between two Pearson Correlations.