A veterinarian wishes to compare the number of times race horses are reported to

Question

A veterinarian wishes to compare the number of times race horses are reported to be lame during a 12-month period compared with similar horses that are not raced. The veterinarian is particularly interested whether the exercise schedule used in racing mav contribute to lameness rather than the total amount of exercise. The veterinarian chooses 9 race horses and then selects for each race horse chosen a horse used in jumping that is the same age, breed, and exercises a similar number of hours each week. The table below contains the observed number of times a horse was lame. Horse Group 1 Kace/ Jum 2 0 2 4 4 The degrees of freedom for a confidence interval for estimating the difference in the mean number of times a race horse is lame and a jumping horse is lame is a. 18 b. 16 d. 8

Explanation / Answer

Since the samples are dependent, this would be a paired t test and there are total of 9 pairs. Hence,

Degrees of freedom = n - 1 = 9 - 1 = 8

Option d is correct.

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