A veterinarian does research on the causes of enteroliths, stones that develop i

Question

A veterinarian does research on the causes of enteroliths, stones that develop in the colon of horses. She suspects that feeding alfalfa might be a cause. To investigate that suspicion, she selects five horses that are known to have enteroliths and compares the number of flakes of alfalfa they have eaten over a month with the number of flakes eaten by five horses free of enteroliths. The researcher obtains the following data: n s Enteroliths group: 5 45 10 Healthy group: 5 28 10 The 95% confidence interval for E – H, where E refers to enteroliths and H refers to healthy was calculated to be (0.799, 33.201). If the calculation had been done by hand and the rule for degrees of freedom use to choose the smaller of (nE – 1) or (nH – 1) the confidence interval would have been

wider.

narrower.

The answer cannot be determined from the information given.

the same.

Explanation / Answer

for as we choose smaller degree of freedom therefore critical value of t would be higher and therefore interval would be wider

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