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. She calculates a two-sample confidence interval for the difference in means and finds that it includes zero. Therefore, she can conclude that: a.all horses get exactly the same amount of alfalfa each day whether or not they have enteroliths. b. all horses get exactly the same amount of alfalfa each month whether or not they have enteroliths. c.on average, horses with and without enteroliths are fed the same amount of alfalfa per month. d.the 10 horses in the sample were fed exactly the same amounts of alfalfa. 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. She calculates a two-sample confidence interval for the difference in means and finds that it includes zero. Therefore, she can conclude that:

Explanation / Answer

right choice is

c.on average, horses with and without enteroliths are fed the same amount of alfalfa per month.

If the confidence interval includes 0 we can say that there is no significant difference between themeans of the two populations, at a given level of confidence.

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