For each hypothesis test use the standard 5-step procedure. 1. One proportion (binomial) 2. Two-proportion (randomization) 3. One-mean (sign test) A sample of 35 non-smokers revealed that 31 of them showed traces of a chemical that appears in the blood of people exposed to second-hand smoke. At the 0.05 level of significance test the claim that more than 80% of non-smokers are exposed to second-hand smoke