Students interpret a variety of bar charts.
http://www.mathsframe.co.uk/barcharts.swf

Other resources by this author can be found at:
http://www.mathsframe.co.uk/free_resources.asp

Click the tranquiliser button every time you see a sheep running for freedom. How fast are you?

http://www.bbc.co.uk/science/humanbody/sleep/sheep/reaction_version5.swf

Click on the rectangle when it turns green. Repeat this five times, to get your average reaction time. Can you make the leaderboard?

http://www.humanbenchmark.com/tests/reactiontime/index.php

Type in one or more words, separated by commas. Google Trends will display line graphs showing the number of searches on those words over the past five months, along with other interesting graphs and statistics.

For example, type: math|maths, coffee (the vertical bar acts like "or"). The data and graphs show that overall more people are searching for maths than for coffee. But not in Washington DC.

Lots of good fun and good maths to be had here.

http://google.com/trends

These are two excellent interactive sites for exploring correlation.

Exploring Correlation
A flash program. The student can move sliders to change the number of points and the correlation coefficient. Points on the scatterplot can be dragged to see how that affects the correlation coefficient. Three thumbs up!
http://www.bc.edu/research/intasc/library/correlation.shtml

Correlation Demo
A java applet. Students can change the number of points and the correlation coefficients, as well as add points. They can also plot the regression line and the residual plot. Three thumbs up!
http://stat-www.berkeley.edu/~stark/Java/Html/Correlation.htm

This is not an interactive resource; rather is an article by Dan Teague from the North Carolina School of Science and Mathematics about 'generating functions', which is an amazing tool for solving some tricky questions about permutations and combinations.

(1) Confidence intervals on the mean are generated for simulated experiments. The confidence level and sample size can be altered. Note that the website currently doesn't work with Netscape/Mozilla 4.0 or higher.
http://www.ruf.rice.edu/~lane/stat_sim/index.html

(2) This applet simulates finding confidence intervals for the mean of a normal random variable. A sample of size 20 is generated from a standard normal random variable.
http://www.math.csusb.edu/faculty/stanton/m262/confidence_means/confiden...

(3) This applet is similar to (2) above, except it repeats the process a chosen number of times
http://socr.ucla.edu/htmls/exp/Confidence_Interval_Experiment.html

And here are some notes/instructions for this applet
http://wiki.stat.ucla.edu/socr/index.php/SOCR_EduMaterials_Activities_Co...

This applet estimates and plots the sampling distribution of various statistics. You specify the population distribution, sample size, and statistic. An animated sample from the population is shown and the statistic is plotted. This can be repeated to estimate the sampling distribution.

http://www.ruf.rice.edu/~lane/stat_sim/sampling_dist/index.html

Add some points to the scatterplot. The applet will calculate the correlation coefficient and the sum of squares. You can also choose to show the least-squares regression line and the x-mean and y-mean lines. Very instructive!

http://bcs.whfreeman.com/yates2e/pages/bcs-main.asp?v=category&s=00020&n...

This is a great little interactive activity. Four scatterplots are displayed along with four correlations. Match them!

http://www.stat.uiuc.edu/courses/stat100/java/GCApplet/GCAppletFrame.htm...