The Buteyko method is a shallow breathing technique developed by Konstantin Buteyko, a Russian doctor, in 1952. Anecdotal evidence suggests that the Buteyko method can reduce asthma symptoms and improve quality of life. In a scientific study to determine the effectiveness of this method, researchers recruited 600 adult asthma patients who relied on medication for asthma treatment. These patients were randomly 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 Likert scale from very bad to very good. On average, the participants in the Buteyko group experienced a significant reduction in asthma symptoms and an improvement in quality of life.

Question : Identify the variables in the study. For each variable, indicate if the variable is quantitative or qualitative. If quantitative is it discrete or continuous. If qualitative is it nominal or ordinal. Briefly explain for each variable.