A study showed that children who watch more than five or more hours of television a day have lower grades than children who watch less. Which of
these could be a hidden variable?
A. Children who watch television might also play video games.
B. TV viewing and school grades might not be related.
C. TV viewing could lead to depression.
D. Children who watch more television may have parents who are
home less often to help them with schoolwork.

How did the mountains on the oregon trail influence the timing of pioneers’ travels? a.) the pioneers wanted to avoid times when there was snow in the mountains. the pioneers wanted to spend as much time as possible enjoying the mountain scenery. b.) the pioneers crossed the mountains in late fall when the trees were bare and the views were good. c.) the pioneers were rugged people who were not impacted by the terrain they crossed at any time.