For each example, state if the study described is an experiment or a correlation. If it is an experiment, identify the independent and dependent variables. If it is a correlation, identify if it is a positive or negative correlation.

1. Researchers are interested in whether eating disorders are related to childhood abuse. They looked at females both diagnosed with eating disorders and no diagnoses of eating disorders and compared it to self-reports of abuse in childhood. They found that females with a history of abuse were slightly more likely to develop an eating disorder than females in the general population.

2. Dr. Benzo is interested in developing a new anti-anxiety drug with less side effects and risk of dependency than the current leading treatments. She gets one group of subjects that take her new super-drug A, one group that takes a placebo, and one group that takes the currently prescribed treatment. She then measures which group has the lowest levels of anxiety.

3. Researchers notice what they feel is a connection between an external locus of control and sustaining injuries in a tornado. They find that for people in Alabama, there is a relationship between having an external locus of control and dying in a tornado.

4. Drs. Dre and Snoop are interested in the effects of smoking marijuana on memory. They predict that smoking marijuana will decrease short-term memory. They expose 100 rats to marijuana smoke three times a day, 100 rats to marijuana smoke one time a day, and 100 rats to no marijuana smoke ever. After one week of this condition, they teach the rats to run a maze and measure how many trials it takes each group of rats to learn the maze.

5. Researchers are interested in the rates of incidence of schizophrenia and socioeconomic status (SES). They compare SES and diagnoses of schizophrenia and find that as SES increases, the likelihood of being diagnosed with schizophrenia decreases.