Mathematics, 15.04.2020 17:20 SchoolSucks234

A veterinary researcher takes an srs of 60 horses presenting with colic whose average age is 12 years. the average age of all horses seen at the veterinary clinic was determined to be 10 years. the researcher concludes that horses with colic are older. the value 10 years is:

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A veterinary researcher takes an srs of 60 horses presenting with colic whose average age is 12 year...