Mike is the boss at a mechanic shop. He is trying to decide whether to buy machine A or machine B. Both machines are used to fix engines. Mike has two mechanics in his shop that do all of the engine fixing. He plans to do an experiment to determine which machine to buy. To do this, he gives mechanic #1, machine A, and mechanic #2, machine B, and he sees how much time it takes them to fix an engine. Then he asks mechanic #1 to use machine B and mechanic #2 to use machine A and then records how long it takes them to fix these engines. Mike assumes that all engines are the same, so any difference in the time it takes his mechanics to fix the engine is due to the machine they are using. He then takes the average time it took his mechanics to fix an engine while using machine A and compared that to the average time it took his mechanics to an engine while using machine B to decide on which machine to get. a. What type of trial design (parallel/crossover) does this scenario most closely resemble? (1 point) b. If a