Here are the steps I would take to design a valid experiment to test this hypothesis: 1. Randomly select and assign participants diagnosed with ADD to either the experimental group (given 20mg Adderall) or the control group (given placebo). 2. Use double-blind procedures so neither participants nor experimenters know who receives Adderall vs placebo. 3. Have all participants complete a focus time task both before and after taking the assigned pill to control for individual differences and...
