Testing Differences: r, Percent, Mean
Creates statistical significance (probabilities) for comparing differences in r (correlation coefficients), percentages, or means in two independent samples.
Correlation coefficients
Element Name | Description |
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Compare correlations | Evaluate the statistical significance for the differences between two correlation coefficients from two independent samples. |
Tests criterion | Specifies whether to compute the probability (statistical significance) for a one-sided test or two-sided test. For a one-sided test, the hypothesis is r1 > r2. |
Correlation r1 | Specifies the Pearson r (correlation coefficient) for the first sample. |
Correlation r2 | Specifies the Pearson r (correlation coefficient) for the second sample. |
Sample size N1 | Specifies the sample size (number of cases) for the first sample. |
Sample size N2 | Specifies the sample size (number of cases) for the second sample. |
Two means
Element Name | Description |
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Two means | Evaluate the statistical significance for the differences between two means from two independent samples, or the difference of an observed mean from a population mean. |
Compare against population | Select this option to compare a mean (the first mean) against a population mean (the second mean); if this option is not selected, a standard two-sample t-test for independent samples will be computed. |
Tests criterion | Specifies whether to compute the probability (statistical significance) for a one-sided test or two-sided test. For a one-sided test, the hypothesis is M1 > M2. |
Mean 1 | Specifies the mean for the first sample. |
Mean 2 | Specifies the mean for the second sample (or population mean). |
Standard deviation 1 | Specifies the standard deviation for the first sample. |
Standard deviation 2 | Specifies the standard deviation for the second sample (this option is ignored if the second mean is a population mean). |
Sample size N1 | Specifies the sample size (number of cases) for the first sample. |
Sample size N2 | Specifies the sample size (number of cases) for the second sample. |
Proportions
Element Name | Description |
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Two proportions | Evaluate the statistical significance for the differences between two proportions from two independent samples. |
Tests criterion | Specifies whether to compute the probability (statistical significance) for a one-sided test or two-sided test. For a one-sided test, the hypothesis is Pr1 > Pr2. |
Proportion 1 | Specifies the proportion for the first sample. |
Proportion 2 | Specifies the proportion for the second sample. |
Sample size N1 | Specifies the sample size (number of cases) for the first sample. |
Sample size N2 | Specifies the sample size (number of cases) for the second sample. |
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