Dr. Goodrich wanted to demonstrate that his tires were better than those of his competitor, Dr. Goodyear. From car registration and leasing records, he found 40 salespeople who drove the same model of automobile approximately the same number of miles per week. Anonymously, Dr. Goodrich hired an independent research assistant who was unaware of the purpose of the study, to randomly assign to 20 of the salespeople a new set of unmarked Goodrich tires, and to the other 20 a new set of unmarked Goodyear tires of the same price and quality. After 6 months and an average of 15,000 miles traveled by both groups, the assistant arranged for the salespeople to exchange tires. After another six months, and similar mileage, the assistant measured the amount of tread wear and reported that the Goodrich tires had actually worn more than the Goodyear tires.a. Identify the independent variable (state how many levels each IV has). Levels refers to the number of different values of the IV that comprise the different treatment conditions (e.g., a study comparing the effectiveness of amount of drug - 3 mg, 6 mg, and 9 mg has 3 levels of the IV of drug dosage).b. Identify the dependent variable(s)c. Identify the type of design (e.g., correlational, non-experimental, quasi-experimental, experimental), and whether repeated measures (same participants in each group/condition) or independent groups (different participants in each group/condition)d. Identify and name any confounding variable(s) and indicate how to fix it/them.