Experimental Study Designs To determine how a new type of sunscreen (Aveeno) affects the general health of skin in comparison to a regular sunscreen (Skin Protect), 40 trial participants were randomly separated into equal groups of 20: an experimental arm and a control arm. All participants' skin health was initially evaluated (measured at baseline). 1. Which sunscreen will the experimental group wear? 2. Which sunscreen will the control group wear? 3. Should we add a third study arm with participants who wear no sunscreen? Why or why not? 4. Where and how should these participants be recruited? 5. What would happen if instead of randomly assigning participants into the two study arms, we instead put the first 20 into the experimental group and the last 20 into the control group? Would this affect the results? How? 6. Should the study be single-blinded? Why or why not? How would this be done? 7. Should the study be double-blinded? Why or why not? How would this be done?

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