McGraw Hill
Arthropods
Are spiders related to crabs? Study the order of arthropods with a reading selection about animal diversity. It provides details about each class within the order, as well as vivid pictures and explanatory charts.
Houghton Mifflin Harcourt
Holt, Rinehart and Winston: Homework Help Independent Practice: Theoretical Probability
Get independent practice working with theoretical probability. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.
Web Center for Social Research Methods
Research Methods Knowledge Base: Probability Sampling
This site from Cornell University contains great information on random or probability sampling. Definitely a site worth checking out on the subject.
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