In a clinical trial to study if an experimental drug can lower diastolic blood pressure, 780 participants with high BP were randomly assigned to one of three groups. Over a one month period, the first group received low dose of the experimental drug, the 2nd group for a high dose of the drug and the third group got a placebo. Neither the patients or the people analyzing the results knew what type of treatment each patient was getting. The diastolic blood pressure (in mmHg) of each participant was measured at the beginning and the end of the period and the change in pressure was recorded. a) list the 5 W's and how, if the information is given. If the information was not given, state that it is not specified (6 marks)

b) list the variables, indicate whether each variable is categorical or quantitative. If quantitative, give units. (4 marks)