Researchers at the University of Houston decided to test the hypothesis that restaurant servers who squat to the level of their customers would receive a larger tip.T In the experiment, the waiter would flip a coin to determine whether he would stand or squat next to the table. The waiter would record the amount of the bill and of the tip and whether he stood or squatted. (a) Describe the treatments. (Select all that apply.) the customer standing squatting amount of tip the waiter Describe the response variable. (Select all that apply.) the customer ? standing squatting amount of tip the waiter (b Dcuss possible extraneous variables and how they could be controlled. (Select all that apply) The behavior of the server. He can keep constant his manner and speed of service The amount of the tip. This can be handled by the coin flip. The behavior of the customer. The waiter can control this by standing when he serves them. The food ordered. This can be handled by the coin flip