Members of the research and development division of a moped tire manufacturer ar
ID: 3271694 • Letter: M
Question
Members of the research and development division of a moped tire manufacturer are investigating the tread life of rubber moped tires. They have suggestd that a study be conducted to determine whether moped tires produced with a new synthetic rubber compound had a longer tread life than the tread life of moped tires produced using a standard rubber compound. A researcher in the division suggested that the study be designed in the following way. Select 60 identical mopeds and randomly assign 30 mopeds to one group, A and the rest to a second group, B. All 60 mopeds will be equipped with front tires produced using a standard rubber compound. However, the mopeds in group A will be equipped with rear tires produced using the new synthetic rubber compound, while those in group B will be equipped with rear tires produced using a standard rubber compound. A total of 60 riders will be randomly selected from the population of students at a local university who regularly ride a moped. The 60 mopeds will be randomly assigned to the 60 students (with a different moped assigned to each student), and the students will be asked to right the moped for an 8 month period. At the end of the 8 month period the researcher will compare the mean amounts of rear tire wear for the mopeds in the two groups. A. Describe the explanatory variable and response variable in this study. B. Describe how this study meets the three requirements for an experiment. C. A university researcher has proposed another design for this experiment. Place one tire with the new compound and one tire with the standard compound on each moped. Randomly choose 30 of the 60 mopeds, and place the tire with the new compound on the front for those mopeds and the tire with the new compound on the rear for the remaining 30 mopeds. Randomly distribute the mopeds to the students. Interchange the front and rear tires after 4 months for all 60 mopeds. Analyze the difference the tire wear on the front and rear tires for all 60 mopeds after 8 months. Describe an advantage that the university researcher's design has over the moped manufacturer's design.Explanation / Answer
3. The advantage is that it removes the biasedness caused due to riding behavior which could be causing insignificant tearing. Also, we will have more observations to have our model on explanatory-response pair