Here are some resources for teaching weapon focus, research methods and statistics. There is a set of stimuli for a weapon focus experiment and a response sheet (copy for the students or project it). The experiment is designed with at least one fatal flaw (failure to counterbalance in a repeated measures design) and several extraneous variables (e.g. image quality). You could use it to demo the general idea underlying most weapon focus research, use it as a stimulus for class discussion etc. Alternately, there is a slideshow to structure a lesson and a set of activities on weapon focus, research methods and statistics.