These are hypothetical data for a small study comparing the effectiveness of three different teachers. Each teacher was randomly assigned a group of 35 high school students and asked to teach a 5-day unit on a new science topic for which none of the students had any prior knowledge. All three teachers used the same curriculum materials and lesson plans, and student learning was assessed using a common 30-item test at the end of the unit. The research question was: Were some teachers more effective than others? Did teachers differ in the amount of learning they were able to produce in their students?
class_dataA data frame with 105 observations on the following 2 variables:
teachercoded as A, B, or C
outcomeeach student's score on the outcome test