A student wanted to compare two types of commuting options. One type is carpooling and the other is taking a commuter train. It is a 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 each morning. A coin flip was used to determine which type of transportation that a student would use first. Results indicated that there was no difference in the two types of transportation. What type of experimental design is this? A. Randomized block design B. Completely randomized assignment C. Matched pair D. Survey What is the response variable in this experiment? A. The coin flip B. The time of arrival C. The types of transportation D. The students What is the treatment? A. The time of arrival B. The types of transportation C. The coin flip D. The students What are the experimental units? A. The students B. The coin flip C. The types of transportation D. The time of arrival Why is a coin used to decide the transportation that a student would use first? A. To show that the experiment is fair B. To introduce an element of chance into the experiment C. To eliminate bias as to which transportation was used first D. None of the above O O O O O O

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