Say that you know that the average amount of milk that American kids drink is 9 ounces per day with a standard deviation of 3. A researcher thinks that children raised on farms will drink more milk on average due to the availability of fresh milk. She collects data from a sample of 16 farm children. As it turns out, they drink an average of 10 ounces a day.
Do the farm children drink significantly more milk per day than average?
Using z for sample means, test (symbol for level of significance) = .01
In this scenario, what is the sample size equal to?
