Suppose you have the three scenarios proposed below. Using the…

Suppose you have the three scenarios proposed below. Using the language of the Levy and Meltzer paper, Scenario(s) ____ can best be described as an observational study, and Scenario(s) ____ can best be described as a randomized experiment.
Scenario A: Suppose researchers have a pool of individuals they can assign treatment status to and survey. Suppose further that they randomly assign some individuals to very generous health insurance coverage and others to less generous coverage. They then track the participants to see how frequently they visit the primary care physician.
Scenario B: Suppose researchers have data on health insurance type and the frequency of primary care visits. They use this data to describe the relationship between health insurance generosity and how often people visit their primary care physician.
Scenario C: Suppose researchers have data on the price of an MRI at every hospital and imaging center throughout the region. Suppose further that they also have data on the number of patients each clinic sees over time. They use this data to describe the relationship between the price of an MRI and the quantity of MRIs performed.
“type a”