This is a PowerPoint presentation that I put together to get our freshman Biological Diversity Lab students up to speed for the phenology lab.  It includes an introduction to graphing, rates of change, total change, lines, and simple linear regression.  This is a 30 minute presentation to be used in the 1 hour of lecture and 3 hours of lab (4 hours total) course that a biologist and I (mathematician) co-taught.  We have about 15 students in each of two lab sections.  Feel free to modify in any way to suit your needs.