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

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...

This applet teaches students in a very dramatic way how changing the "bin width" of a histogram can dramatically alter the shape of the histogram. Lesson: you should graph your data with a number of different bin widths and choose the one that you feel best represents the data.

http://www.stat.sc.edu/~west/javahtml/Histogram.html

A clever web page for constructing a bar graph on the fly. All the necessary elements are editable - scales, axis labels, title, etc.
http://www.amblesideprimary.com/ambleweb/mentalmaths/grapher.html

The Stroop Test is a fun and engaging way to collect numerical data for later analysis and display. From the flipchart: "In the Stroop Test, the participants are given a list of words, and are asked to say the colour of the word, and not the word itself ... Most people take longer to say the colour of the word when the colour of the word doesn't match the word itself."

http://www.babynamewizard.com/namevoyager/lnv0105.html
The Baby Name Wizard is a fascinating website that graphically displays the number of babies with different names over the years. You can easily track the popularity of different names. What do you think was the most common boy's name and most common girl's name in 1990?

Note that the website takes some time to appear as it has to download a lot of data. Be patient!

The Baby Name Wizard is a fascinating website that graphically displays the number of babies with different names over the years. You can easily track the popularity of different names. What do you think was the most common boy's name and most common girl's name in 1990?

Note that the website takes some time to appear as it has to download a lot of data. Be patient!