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This page generates a graph of the sampling distribution of the difference between two means and displays the probabilities associated with that distribution. Users enter the population standard deviation and the...
Richard Lowry of Vassar College has created this java script which calculates the areas under the curve of the normal distribution falling to the left of -z, to the right of +z, and between -z and +z. This page is v...
This page, created by Richard Lowry of Vassar College, generates a Poisson distribution, as approximated by the binomial. After clicking continue, users must enter the sample size (n>39) and probability of success...
Given the population incidence of a certain disease, and the conditional probabilities of positive and negative test results, what are the probabilities for a particular test result of a true positive, true negative,...
Validation of psychological tests has not yet been adequately conceptualized, as the APA Committee on Psychological Tests learned when it undertook (1950-54) to specify what qualities should be investigated before a...
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