Question: researchers want to compare whether competing in soccer vs football...
Researchers want to compare whether competing in Soccer vs Football vs Swimming vs Cross Country vs Track vs Nothing might have any relationship with differences in VO2maxx when they are 40 years old?
What is the independent variable(s) in this research question?
A) 40 years old
B) The number of sports people played
C) The sport competed in
E) Soccer, Fotball, Swimming, Cross Country, Track, & Nothing