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Scholastic
Scholastic: Data Sampling
Data Sampling is a cutting-edge digital program designed to give middle schoolers multiple opportunities to dig deeply into the mathematics and real-world purposes of representative sampling.
Khan Academy
Khan Academy: Making Inferences From Random Samples
Practice making inferences from random samples.
Education Place
Houghton Mifflin: Eduplace: Math Steps: What Is It? Data
This is a great place for lesson information on the concept of analyzing data - measures of central tendency. Three other tabs are available besides the "What Is It?" link. Tips and Tricks, When Students Ask, and Lesson Ideas also...