We are interested in what happens to the incidence of substance abuse among adults with schizophrenia as they age. We survey a sample of people aged 50-55 in 1999 about their drug and alcohol use, and then we draw a new sample from the same population, this time aged 60-65 in 2000, and another new sample of those aged 70-75 in 2001. This is an example of
A) a cohort study
B) a trend study
C) a panel study
D) a cross-sectional study
E) an inappropriate study

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The Answer of We are interested in what happens to the incidence of substance abuse among adults with schizophrenia as they age. We survey a sample of people aged 50-55 in 1999 about their drug and alcohol use, and then we draw a new sample from the same population, this time aged 60-65 in 2000, and another new sample of those aged 70-75 in 2001. This is an example of
A) a cohort study
B) a trend study
C) a panel study
D) a cross-sectional study
E) an inappropriate study

We Are Interested in What Happens to the Incidence of Substance