You are planning to conduct a research project in your ED and are currently working out an appropriate design for your study.

1. List and describe (4) different types of control groups. (4 marks) 4 marks

2. Complete the following table by providing (2) strengths and (2) limitations of a retrospective study design. (4 marks) 4 marks

3. Complete the following table regarding observational studies. (4 marks) 4 marks