Visualizations, specially dynamic ones can help in the understanding of statistical concepts. You can find some wonderful examples at a web site called **R <- psychologist.**

Do you understand hypothesis testing? and the controversy behind it?

Understanding Statistical Power and Significance Testing

Do you understand confidence intervals (CI)?

Interpreting Confidence Intervals

When you see a scatter plot are you able to guess a value for the correlation?

Interpreting Correlations

Have fun! and get some new insights about statistical tests.