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Social Studies, 15.04.2020 19:07 AlexRavenwood127
In one study (Hedrick et al., 1993), researchers compared the number of motorcycle fatalities that occurred before helmets were mandatory, after helmets were mandatory, and after the helmet laws were repealed. This study used an format with the interrupted time-series design.
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In one study (Hedrick et al., 1993), researchers compared the number of motorcycle fatalities that o...
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