Rhino viruses typically cause common colds. In a test of the effectiveness of​ echinacea, 40 of the 45 subjects treated with echinacea developed rhinovirus infections. In a placebo​ group, 77 of the 91 subjects developed rhinovirus infections. Use a 0.05 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts​ (a) through​ (c) below.