a milk producer wonder if a duea additive will increase milk production in his cows. He divides the herd into four groups: in addition to their regular diet, group "a" receive a full foes of the additive, Group B receives a hafl dose of the addictive, group c receives a quarter dose of addictive. A fourth group group D just receive a regular diet no addictive. All cows are the same breed and receive equal amounts of sunlight, water and opportunities for exercise. After 6 months, he records the amount of milk produced daily by each herd. What's a testable hypothesis? What's the independent and dependent variable? Name controlled variables. What are levels of treatment? What is the control group