Astudent wanted to compare two types of commuting. one type is carpooling and the other is taking train. it is common belief that carpooling saves more time. this belief is tested by having 10 students commute to school by each mode of transportation and record the time of arrival at school. a coinflip was used to determine which type of transportation that astudent would use first. results indicated no difference. what is the treatment? the types of transportationwhat are the experimental units? the studentswhy is a coin used to decide the transportation student would use first? to eliminate bias as to which transportation wasused first.