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QUESTION 15 Which of the following will make a confidence interval wider? Only choose one. A. decreasing standard deviation B. increasing sample size C. decreasing confidence level D. none of the above QUESTION 16 The American Veterinary Medical Association conducted a survey of veterinary clinics to estimate the proportion that treat large animals (cows, horses, etc.). The survey was mailed to 120 randomly selected veterinary clinics throughout the country, and, 32 responded they treat large animals. A 95% confidence interval for the proportion of veterinary clinics that do treat large animals is (0.187, 0.346). What is the correct interpretation of this confidence interval? We have 95% proof that the population proportion of veterinary clinics that treat large animals is between 0.187 and 0.346. We have 95% proof that the sample proportion of veterinary clinics that treat large animals is between 0.187 and 0.346. We are 95% confident that the population proportion of veterinary clinics that treat large animals is between 0.187 and 0.346. We are 95% confident that the sample proportion of veterinary clinics that treat large animals is between 0. 187 and 0.346. QUESTION 17 After a week-long fishing trip in Brevard, NC, you and your friends have caught 100 rainbow trout. (You put some of them back!) The distribution of lengths of rainbows is known to be Normal with a population standard deviation of 4 inches. From your sample you find an average of 22 inches. A 95% confidence interval for the true mean length of rainbow trout is 22 + 0.08. 22 + 0.78. 22 + 0.79 22 + 0.93