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This calculator runs a two sample test for the difference of independent correlations test for a given sample data set and specified null and alternative hypotheses. Enter the data in the text area to the left. The data must be formatted with a label that identifies the condition (group) and one pair of scores for each row. The data on each row must be separated by a space, tab, or comma. Alternatively, below the text area, you can enter the sample correlations and sample size values.
Enter a value for the null hypothesis. This value should indicate the absence of an effect in your data. If you want to test for a difference of correlations, the value should be zero. The null value must be between \(-2\) and \(+2\). If you enter a value other than zero, you will be prompted to enter the null population proportions in additional text fields.
Indicate whether your alternative hypothesis involves one-tail or two-tails. If it is a one-tailed test, then you need to indicate whether it is a positive (right tail) test or a negative (left tail) test.
Press the Run Test button and a table summarizing the computations and conclusions will appear below.
Contrary to other hypothesis testing calculators in this textbook, this program does not compute a confidence interval for the difference of correlations. While a confidence interval can be generated, in principle, the calculations involve concepts beyond the coverage this textbook.
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