Statistics (Mathematics)
Two Events: Multiplication Law 
A quick overview of the multiplicaiton law used in probability. There is a pretty nice little java applet to help you visualize the math.
Receiver Operating Characteristic Curves: an Introduction
This might be a little more than just an introduction into ROC curves. This specific lecture goes over statistical sensitivity, specificity, false negative fractions and false positive fractions and how they all work together in making a ROC curve. The other benifit of this lecture is that it does...
Chi-Square Value Calculator
From the site: Computes a chi-square value, given the probability and the degrees of freedom.
p-Value Calculator for the Chi-Square Test
From the site: This calculator will tell you the one-tailed probability value of a chi-square test (i.e., the area under the chi-square distribution from the chi-square value to infinity), given the chi-square value and the degrees of freedom.
ANOVA Intraclass Correlation Calculator
From the site: This calculator will compute the intraclass correlation for an analysis of variance (ANOVA), given the between-groups mean square, the within-groups mean square, and the number of subjects in each group.
One-Way ANOVA from Summary Data
From the site: This calculator will generate a complete one-way analysis of variance (ANOVA) table for up to 8 groups, including sums of squares, degrees of freedom, mean squares, and F and p-values, given the number of subjects, mean, and standard deviation for each group.
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