Question

A veterinary researcher takes an SRS of 60 horses presenting with colic. The average age of the 60 horses with colic is 12 years. The average age of 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 a:   sample mean. population mean. sample distribution. sample variance.

Answer 1

10 is the population mean.

The SRS he takes, the simple random sample, is the 60 horses with colic.  The population would be all of the horses seen at the clinic.  Therefore the mean of the horses seen at the clinic would be the population mean.