Dale Berger at Claremont ... sent this to the EDSTAT list I run ... you might find some of the WISE applets to be helpful. ==================
EDSTAT-L members are invited to visit our teaching website at http://wise.cgu.edu where we have recently added fun interactive applets to demonstrate how confidence intervals are created and how confidence intervals on bar charts are commonly misinterpreted. Another recent addition is an expanded tutorial on statistical power, joining tutorials on sampling distributions, hypothesis testing, central limit theorem, etc. Comments and suggestions are welcome!