A study was conducted at the Virginia- Maryland Regional College of Veterinary Medicine Equine Center to determine if the performance of a certain type of surgery on young horses had any effect on certain kinds of blood ceil types in the animal. Fluid samples were taken from each of six foals before and after surgery. The samples were analyzed for the number of postoperative white blood cell (WBC) leukograms. A preoperative measure of WBC leukograms was also measured. Use a paired sample t-test to determine if there is a significant change in WBC leukograms with thesurgery.

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Foal Presurgery* Postsurgery* 10.80 10.60 16.60 17.20 14.00 10.60 8.60 12.90 9.59 8.81 12.00 6.07 4 *All values x 10-3,