A manufacturer of fish food is interested in determining whether an extra portion of food each day will increase the weight of rainbow trout being raised in a fish hatchery.In a large tank, which is located next to a large window, are 50 trout of various sizes and ages.The weight of each trout is measured and recorded.A researcher drops a dividing wall down the middle of the tank, trapping half the trout on each side.The dividing wall is parallel to the window.The researcher flips a coin to decide which side of the tank gets an extra portion of food each day. The other side of the tank gets a standard-sized portion of food.After four weeks the weight of each trout is again measured and recorded.The trout that received an extra portion of food each day averaged 12% greater weight gain than those in the group receiving the portion of food.

(a) What is (are) the experimental unit(s) in this experiment?

(b)How was randomization used in this experiment?

(c) Given that the goal of the experiment was to compare the weight gain of trout given an extra portion of food daily to those who received a standard amount of food, was replication used properly in this experiment?Justify your answer.

(d)Explain the concept of confounding and include an example of confounding in the context of this situation.

(e) Can we conclude that getting an extra portion of food each day led to the increase in the weight fain of the trout?Explain your reasoning.