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21. A veterinarian studying causes of enteroliths in horses suspects feeding too much alfalfa may be a culprit. The veterinarian hypothesizes that more than two thirds of all horses with enteroliths are fed mostly alfalfa. The proper hypothesis statement is a. Ho: p = 0.67, Ha: p<0.67. b. Ho: p=0.67, Ha: p>0.67. c. Ho: p=0.67, Ha: p > 0.67. d. Ho: p=0.67, Ha: p<0.67.