Veterinary researchers at a major university veterinary hospital calculated a 99% confidence interval for the average age of horses admitted for laminitis, a foot disease that leaves the horse severely lame, as 6.3 to 7.4 years. based on this information we conclude that:
a) all of the above
b) we can be 100% sure that the average age of horses admitted with laminitis is between 6.3 and 7.4 years.
c) we are 99% confident that the true mean age of horses with laminitis is between 6.3 and 7.4 years old.
d) 99% of all horses admitted for laminitis are between 6.3 and 7.4 years old.