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a) Identify the population of interest and the sample in this study.
A population of interest is all asthma patients aged 18-69 who relied on medication for asthma treatment.
The sample in this study is a sample of 600 asthma patients ages 18-69 who relied on medication for asthma treatment.
b) Comment on whether or not the results of the study can be generalized to the population, and if the findings of the study can be used to establish causal relationships.
The results of the study cannot be generalized to the general population since the sample wasn’t taken randomly, so it’s unclear whether they are representative.
The study, however, does suggest a causal relationship because it was a randomized experiment.