PBS
Pbs Mathline: Fill 'Er Up Lesson Plan [Pdf]
Middle schoolers will pour liquids into different sized containers to test their predictions as to the amount each will hold. Printable lesson.
Brown University
Linear Interpolation
This site explains how linear interpolation allows for prediction and gives several examples.
Alabama Learning Exchange
Alex: Relationship Between Height and Length
In this activity, eighth grade students will collect data. They will use this data to analyze the relationship between the height of an individual and the length of his/her foot. Students will use a line of fit to make predictions for...
Other
Stat Soft: Statistics Glossary
Dozens of statistical terms are defined and illustrated in this glossary.