Veterinary Science: Tranquilizer Morgan is a veterinarian who visits a Vermont farm to examine prize bulls. In order to examine a bull, Morgan first gives the animal a tranquilizer shot. The effect of the shot is supposed to last an average of 65 minutes, and it usually does. However, Morgan sometimes gets chased out of the pasture by a bull that recovers too soon, and other times becomes worried about prize bulls that take too long to recover. By reading journals, Morgan has found that the tranquilizer should have a mean duration time of 65 minutes, with a standard deviation of 15 minutes. A random sample of 10 of Morgan’s bulls had a mean tranquilized duration time of close to 65 minutes but a standard deviation of 24 minutes.

At the 1% level of significance, is Morgan justified in the claim that the variance is larger than that stated in the journals? Find a 95% confidence interval for the population standard deviation.

AppendixLO1