Dr. Xi conducted an experiment on the effectiveness of an antidepressant medication. Given her research design, if she finds tha
t the drug is effective, which of the following will she be able to conclude? Antidepressants are related to reduced depression, because she found a negative correlation between depression levels and the administration of antidepressant medication. A Placebos are just as effective as antidepressants in treating depression, because she found that both placebos and antidepressants decreased depression by the same amount. B Antianxiety medication is related to reduced depression, because she found a negative correlation between depression levels and the administration of antianxiety medication. C Antidepressants decrease the severity of depression, and the experiment demonstrates cause-and-effect because she used random assignment. D Antidepressants decrease the severity of anxiety, and the experiment demonstrates cause-and-effect because she used random assignment.
the three major elements that separate the world's haves from the have-nots are developing agriculture, living in areas without natural geographic barriers, and acquiring immunity to diseases.
