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This tutorial, by David Polson of Athabasca University, introduces 9 sources of threat to internal validity in Part 1 and asks the user to classify hypothetical experiments as either internally valid or invalid and...
This page will calculate the lower and upper limits of the 95% confidence interval for the difference between two independent proportions, according to two methods described by Robert Newcombe, both derived from a...
Calculates the zratio and associated onetail and twotail probabilities for the difference between two correlated proportions, such as might be found in the case where the proportions are based on the same sample of...
This page will calculate the 0.95 and 0.99 confidence intervals for rho, based on the Fisher rtoz transformation. To perform the calculations, enter the values of r and n in the designated places, then click the...
This page will perform the procedure for up to k=12 sample values of r, with a minimum of k=2. It will also perform a chisquare test for the homogeneity of the k values of r, with df=k1. The several values of r can be...

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