See if you can describe a study which uses an experimental design looking at the link between childhood exercise levels and symptoms of Attention Deficit Hyperactivity Disorder (ADHD) (if you are unsure of this please have another look at the section on ‘Randomised Control Trials’ above). When you have done that see if you can design a study which uses a quasi-experimental design (please bear in mind what the difference is between experimental and quasi-experimental designs). Finally, do the same again but use a correlational design

(remember when we are doing correlational research we simply measure the variables of interest and then see how they are related to each other).