Question

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 recording 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. Complete parts (a) through (1) below. (a) What type of experimental design is this? Completely randomized design Case-control study Randomized block design O Matched-pairs design (b) What is the response variable in this study? The students The coin flip O The time of arrival The types of transportation (c) What is the factor that is set to predetermined levels? What is the treatment? A. The factor is the type of transportation. The treatments are carpooling and taking a commuter train. B. The factor is the time of arrival. The treatments are carpooling and taking a commuter train. C. The factor is the students. The treatments are the 10 different students. D. The factor is the coin flip. The treatments are heads and tails. (d) Identify the experimental units. Choose the correct answer below. O The students The types of transportation The time of arrival The coin flip (c) Why is a coin used to decide the transportation that a student would use first? O A. To introduce an element of chance into the experiment B. To show that the experiment is fair C. To eliminate bias as to which transportation was used first D. None of the above (f) Draw a diagram to illustrate the design. Choose the correct diagram below. OA. Figure 1 Ов. Figure 2 carpooling Random assignment to treatments Compare times of arrival Randomly assign cach student to both treatments Administer treatments and record times of arrival For each student, compare the times of arrival Cip? commuter train

Answer 1

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