Can a conclusion that the exercise program caused more sleep?
a. A cause and effect relation might be concluded because the study had a control group.
b. A cause and effect relation might be concluded because the study was a randomized experiment.
c. A cause and effect relation cannot be concluded because the study was an observational study.
d. A cause and effect relation cannot be concluded because diet was not controlled.
Question 2
What is the explanatory variable in the study?
a. Amount of food eaten (calories) per day
b. Following an exercise program four times a week for 16 weeks (or not)
c. Amount of sleep per night
d. Age
Sequential decline of whale catches in the Antarctic shows the strong effect of human predators.
Thinning of eggshells caused by DDT.
Continued harvest of (a) cod and (b) mountain sheep by humans has caused evolutionary changes in mat
The fact that a mother works outside the home has no negative effect on the well-being of her child ...
Stages of Sleep
Chemistry - Problem Exercise