In placebo-controlled clinical trials for the drug Viagra, 734 subjects received Viagra and 725 subjects received a placebo (subjects did not know which treatment they received). The table in the next column summarizes reports of various side effects that were reported.

(a) Is the variable “adverse effect” qualitative or quantitative?
(b) Which type of graph would be appropriate to display the information in the table? Construct the graph.
(c) What is the estimated probability that a randomly selected subject from the Viagra group reported experiencing flushing? Would this be unusual?
(d) What is the estimated probability that a subject receiving a placebo would report experiencing flushing? Would this be unusual?
(e) If a subject reports flushing after receiving a treatment, what might you conclude?
(f ) What type of experimental design is this?

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Viagra (n- 734) Placebo (n725) Adverse Effect Headache Flushing Dyspepsia Nasal congestion Urinary tract infection Abnormal vision Diarrhea Dizziness Rash 29 73 51 29 15 15 15 0 15 15