Activity Bicycles Football Basketball Playground Soccer Baseball All-Terrain Vehicle Hockey Skateboarding Swimming Horseback Riding Total Frequency 23,405 20,293 11,507 10,414 7,667 7,433 5,220 4,111 4,408 3,846 2,648 100,952 Researchers examined all sports-related concussions reported to an emergency room for children ages 5 to 18 in the United States over the course of one year." Table 2.7 displays the number of concussions in each of the major activity categories. a) Are these results from a population or a sample? (b) What proportion of concussions came from playing football? (c) What proportion of concussions came from riding bicycles? (d) Can we conclude that, at least in terms of concussions, riding bicycles is more dangerous to children in the US than playing football? Why or why not?

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