< Question 15 of 25 ) A veterinarian was studying suspected causes of enteroliths, concrete-like balls...
< Question 15 of 25 ) A veterinarian was studying suspected causes of enteroliths, concrete-like balls in the colons of horses. She suspected that a diet of mostly alfalfa could be a cause. In a study conducted at a veterinary research facility, she examined the records of 62 horses with enteroliths (cases) and compared them with the records of 75 horses free of enteroliths (controls). She found that 42 case horses were fed mostly alfalfa, compared with 17 control horses. To assess the conjecture that horses fed primarily alfalfa are more prone to getting enteroliths, she tested Ho : Pease - Pcontrol = 0 vs. He : Pease - Pcontrol > 0, where case is the proportion of horses with enteroliths that are fed mostly alfalfa and control is the proportion of control horses mostly fed alfalfa. ns The standard error of Pease – Pcontrol for the hypothesis test is given by: O 0.077. 0.085. O 0.0132. O 0.0073.