Which type of research study compares disease rates among population groups, and attempts to identify related conditions or behaviors?
a. placebo
b. clinical trial
c. case control
d. epidemiological

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You're doing research for a public essay on alternative medicine. which of the following sources has the most reliable information? a. a post on a social networking site about the undesired side-effects of different alternative medicinesb. a recent government report comparing the results of alternative and contemporary medicine for a specified diseasec. an anonymous article on a medical website that claims the success of alternative medicined. a 2003 study conducted by a medical research center about the effects of alternative medicine

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