This site is an example of a well-written expository essay from the University of Victoria. Gives excellent tips for students, such as organization, paragraph development, and support. W.9-10.2a Intro/org/graphics

This site shows exactly how to write a memo. The site talks about the components to use: header, purpose, summary, discussion, action.

This lesson continues an exploration of variability in sample proportions that was begun in the Part 1 video, extending the ideas. About four minutes in, it provides a link to an interactive web app called "Sampling Distribution of the Sample Proportion." Includes downloadable study guide with exercises - guide also covers other topics. [11:06]

Watch this tutorial to discover how to use a sample to make a prediction about a population. [5:16]

Students use DNA profiling to determine who robbed a bank. After they learn how the FBI's Combined DNA Index System (CODIS) is used to match crime scene DNA with tissue sample DNA, students use CODIS principles and sample DNA fragments to determine which of three suspects matches evidence obtain at a crime location. They communicate their results as if they were biomedical engineers reporting to a police crime scene investigation.