Here are some potential experimental designs that could be used for each scenario:
- Comparing the effectiveness of two teaching methods:
Quasi-experimental design or randomized controlled trial. Assign students randomly to groups using each method. Measure performance on pre- and post-tests.
- Studying the impact of class size on student engagement:
Correlational design. Measure class size and student engagement (dependent variable) across many classes. Look for relationship between the two variables.
- Exploring relationship between teacher training and student outcomes:
Longitudinal design. Track student outcomes over time as their teachers receive different levels of training. Look for changes in outcomes associated with training level.
- Examining effects of