True or False: Case-control studies use a strategy that identifies health outcome status initially and then determines exposures of the study population.TrueFalse

True or False: Case-control studies can directly measure the risk or rate of a health outcome?TrueFalse

When is a case-control study design typically used in epidemiological research?Select one alternative:When researchers know the exposure but not who is sick or healthy.When researchers know who is sick and who is healthy, but do not know the exposure.When researchers know both the exposure and the health status of individuals.When researchers randomly assign participants to control and experimental groups.

True or False: A cohort study is the best method for associating cause and effect when exposure or treatment cannot be controlled by the investigator but when we want to be certain that exposure preceded the health outcome.True False

Case control studies are:Question 4Select one:a.Always at risk of attrition biasb.Always retrospective and observationalc.Always considered to be experimental by designd.Always prospective, with the investigator looking forward in time

True or false: In a cross-sectional study we cannot determine whether exposure precedes the health outcome.TrueFalse