For each of the following hypothetical research projects, indicate the dependent and independent variables, making sure to specify and define the levels of the independent variable. How many levels are there in each scenario? How many groups will be required in the study?

5. You want to investigate the effects of energy drinks on college-age adults. All the participants were between the ages of 19 - 25. One group of participants was allowed to sleep 4 hours the previous night, one group was sleep deprived, and one group was allowed to sleep a full night's sleep (8 hours). The next morning, the participants came into the lab and were asked to drink one energy drink every six hours. Memory and attention were measured using standardized tests.