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Lesson App 1.4 Who wears seat belts? 7 6 7 89 Each year, the National Highway Traffic Safety Administration (NHTSA) conducts an observational 23 study of seat belt use in all 50 states. Trained 4455 observers are placed at randomly selected locations 66666777 10 1 1 00 00 00 00 00 along roadways in each state, who then record data on 99999 seat belt use by people in passing vehicles. The 0000011111 2222223333 stemplot shows the percent of observed people who KEY: 8/4 is a state 455 were wearing seat belts in each state during the 2018 with 84% of people 9 666 wearing seat belts NHTSA study. 9 8 1. Why did we split stems when making this stemplot? 2. In how many states was seat belt use observed to be at least 95% in 2018? Some states enforce a seat belt violation as a Primary enforcement Secondary enforcement primary offense, while other states only enforce 7 16 a seat belt violation as a secondary offense. 8 7 19 The back-to-back stemplot shows the percent of 08 observed people who were wearing seat belts 8 4 8 455 in primary enforcement versus secondary 76 8 666677 enforcement states during the 2018 NHTSA 9999 8 19 study. 1 111 10000 9 10 333322222 12 KEY: 8/4 is a state 3. Compare the distributions of seat belt use in 5554 with 84% of people primary and secondary enforcement states. 666 wearing seat belts 8