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.

The standard error SE of the sample proportion of clinics that do not treat large animals, is