39. A veterinarian does research on the causes of enteroliths, stones that devel

Question

39. 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 statistician at the local university tells the veterinarian that she cannot use a two-sample t test after a careful talk with the researcher. Therefore, she decides to use a permutation test. The observed difference in is EXH. There are 252 possible samples for the 10 observed values. These samples all have the same probability of occurring under the null hypothesis that E- . Therefore, the probability of the observed difference is A) 0.10 B) 0.01 C) 0.04 D) 0.004

Explanation / Answer

solution........................................................

Probability of the observed difference = 1/10 =0.10

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