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The RSPCA Australia conducted a survey of veterinary clinics to estimate the proportion that do not treat large animals (cows, horses, etc.). The survey was mailed to a random sample of 150 veterinary clinics registered with the RSPCA throughout the country. A total of 120 veterinary clinics replied and of these, 88 responded that they do not treat large animals.
Calculate the 95% confidence interval for p, the true population proportion of veterinary clinics that do treat large animals. Use the "plus-four" method.