answer all questions with explanation

(Study 2) The Buteyko method is a shallow breathing technique developed by Kon- stantin Buteyko, a Russian doctor, in 1952. Anecdotal evidence suggests that the Buteyko method can reduce asthma symptoms and improve quality of life. In a sci- entic study to determine the effectiveness of this method, researchers recruited 600 asthma patients aged 18-69 who relied on medication for asthma treatment. These patients were split into two research groups: one practiced the Buteyko method and the other did not. Patients were scored on quality of life, activity, asthma symptoms, and medication reduction on a scale from 0 to 10. On average, the participants in the Buteyko group experienced a signicant reduction in asthma symptoms and an improvement in quality of life. a) What is the type of each study? b) What is the sample of each study? c) What is the type of sample? Select from {random sample, convenient sample, volunteer sample, or unknown} d) What are the explanatory variable and response variable of each study? e) Based on the descriptions given, can we establish causal relationships between the explanatory variable and response variable in each study