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 120 veterinary clinics throughout the country and of these, 88 responded that they do not treat large animals.

Using the "plus four" method, a  95% confidence interval for p, the proportion of veterinary clinics that do not treat large animals is: