The actuary for York Insurance Company wants to know the proportion of its policyholders who have tried alternative treatments (such as acupuncture, herbal therapy, etc). 40 of the company's policyholders were randomly sampled and asked whether or not they had ever tried such treatments. The following were their responses. Yes No Yes No No Yes Yes No Yes No Yes Yes Yes No Yes No Yes No Yes Yes Yes Yes Yes Yes Yes No Yes No Yes No Yes Yes Yes No Yes Yes Yes No Yes No Construct a 93% confidence interval for the proportion of this company's policyholders who have tried alternative treatments.