Most American adolescents don't eat well and don't exercise enough. Investigators designed a “physical activity intervention” to increase activity during physical education classes and during
leisure periods throughout the school day. They also designed a “nutrition intervention” that
improved school lunches and offered ideas for healthy home-packed lunches. Each participating
school was randomly assigned to one of the interventions, both interventions, or no intervention.
The researchers observed physical activity and lunchtime consumption of fat.
14. The response
A) the two intervention techniques.
B) is the physical activity and lunchtime consumption of fats.
C) is the “nutritional intervention.”
D) is the “physical activity intervention.”
15. This study has
A) four factors.
B) four treatments.
C) two treatments.
D) none of the above.
16. This study uses the principles of
A) randomization.
B) confounding.
C) blocking.
D) all of the above.