This applet demonstrates the partitioning of sums of squares in analysis of variance (ANOVA). It includes some sample values and allows the user to make adjustments, which then shows the new values in the ANOVA table. ...

Professors of the University of Washington, Bothell Campus, have designed this course that aims to apply scientific and mathematical discovery to social science questions. Students are trained “to conduct surveys,...

Averages are meant to convey the essential features of a set of data, or a random variable, in a simple and a concise way. Like any other summary, an average can be misleading, misused and abused; there is a fair amount...

Richard Lowry of Vassar College has created this page to display the sampling distribution and the standard error of the difference between two sample means. To calculate standard error, enter the standard deviation of...

This article describes an interactive activity illustrating general properties of hypothesis testing and hypothesis tests for proportions. Students generate, collect, and analyze data. Through simulation, students...