1.2 Sinusitis and antibiotics, Part I:  Researchers studying the effect of antibiotic treatment for acute sinusitis compared to symptomatic treatments randomly assigned 166 adults diagnosed with acute sinusitis to one of two groups: treatment or control. Study participants received either a 10-day course of amoxicillin (an antibiotic) or a placebo similar in appearance and taste. The placebo consisted of symptomatic treatments such as acetaminophen, nasal decongestants, etc. At the end of the 10-day period, patients were asked if they experienced improvement in symptoms. The distribution of responses is summarized below. (Garbutt et. al., 2012)

(Please round all percentages to one decimal place)




a) What percent of patients in the treatment group experienced an improvement in symptoms? %
b) What percent of patients in the control group experienced an improvement in symptoms? %
c) In which group did a higher percentage of patients experience improvements in symptoms?