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For the following scenarios, describe the type of study design: Answer a, b, c, or d

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For the following scenarios, describe the type of study design: Answer a, b, c, or d.

a. Cross-sectional study

b. Case-control study

c. Cohort study

d. Correlation study

 ________ A study was done to look at melanoma and sun exposure in a population in Arizona. Prevalence rates in Arizona were compared to prevalence rates of melanoma and sun exposure in Alaska. The researchers found people in Arizona had a higher prevalence of melanoma and sun exposure than those in Alaska.

 ________ Over a 3-month period, 12,000 patients with hepatitis will be categorized as alcoholic or nonalcoholic. Then over the next 20 years, new cases of liver cancer will be classified out of the 12,000.

 ________ Over a 6-month period, all incoming residents into a nursing home over 55 years of age were asked whether they currently have diabetes and whether they have a history of skin infections.

 ________ Over a 1-year period, 100 cases of hepatitis were identified and a similar number of persons without hepatitis were recruited to participate in a statewide study looking at prior history of alcohol usage.

 ________ All school children in five schools are given a physical fitness test during May and June 2015. At the time the test results are collected, current risk factors for obesity were ascertained.