Sports-Related Concussions in Kids 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?

Table 2.7 Concussion frequency by activity in children ages 5-18

Activity	Frequency
Bicycles	23,405
Football	20,293
Basketball	11,507
Playground	10,414
Soccer	7,667
Baseball	7,433
All-Terrain Vehicle	5,220
Hockey	4,111
Skateboarding	4,408
Swimming	3,846
Horseback Riding	2,648
Total	100,952