Tables and Calculators 

This is an alternative to tables, allowing the calculation of probabilities and critical values with means (Mu) and standard deviations (sigma), critical values. 

The Missouri State Rstats Institute has a number of statistical calculators which may be useful. 

Computes power for alpha with hypothesized means, standard deviation, and N. 

Computes chi square for departure from expected for one
nominal variable based upon observed and expected distribution. 

This computes Chi Square for a R x C contingency table 

includes significance of correlations 

Input df to obtain critical values of t 

Input dfs to obtain critical values of F 

Input df (r1)*(c1) to obtain critical values of chisquare 

This computes an ANOVA table for a two factor design with up to 4 levels of each variable. 
External Tutorials 

The Khan Academy has developed an extensive set of free teaching tutorials on statistics as well as other topics. Use these to get an additional review of computations and concepts. 

These youtube videos offer a variety of illustrations of the concepts in this course. 