“…To test each hypothesis, one must design and conduct an experiment. Therefore, students should be able to vary the independent variables, as well as be able to operationalize and measure the dependent variables (e.g., [15,20,29,30,37]) and control confounding variables (e.g., [33,38]). Furthermore, students need to be able to define test times (i.e., start, interval and duration of measurement; e.g., [20,30,32]) and students need to be able to use experimental replications (e.g., [20,34,39]).…”