Bill Cerbin, Melanie Cary, Rob Dixon, Carmen Wilson UW-La Crosse Bystander Intervention: Explaining Behavior in Terms of Multiple Variables The lesson topic is the psychology of "bystander intervention" (i.e., why onlookers help or do not help a stranger in need of assistance). Research indicates that a number of factors influence how bystanders interpret an incident and whether they assume responsibility to help (e.g., the number of bystanders present, whether the victim appears to need and deserve help, etc.). Jun 19, 2006

Scott Cooper, Anne Galbraith, Tim Gerber, Deb Hanmer, Dan Sutherland UW-La Crosse Impact of human population size on quality of life and the environment This lesson is designed to be taught in an ecology section that also includes basic population biology. The goal is for students to use their understanding of population growth to see how the populations of different countries will change over time. Jul 14, 2006

Laura Schmidt, Diane Christie, Anne Antonippillai, Haiyan Tian UW-Stout Mathematics: Difficulties in Combining Rational Expressions The lesson reviewed addition and subtraction of fractions, demonstrated addition and subtraction of simple rational expressions, and worked up to difficult examples. The lesson began with three examples of rational numbers, one with common denominators and two with un-like denominators, followed by rational expressions with common denominators. Sep 22, 2006

Heather Hulett, Abdul Elfessi, Dan Nordman UW-La Crosse Statistics: Creating a Sampling Distribution The lesson helps students differentiate and explain three statistical terms at the heart of statistical inference: the mean of a population, the mean of a sample of observations, and the mean of the sample means. Sep 13, 2006