People eat Wheaties some mornings, doughnuts other mornings and you look at attention span in class. Each subject reads non-word list and word list. Rating of how much person liked the episode. You find a correlation between amount of exercise and health. The more a person exercises, the less often they get sick.
Married men live longer than unmarried men.
Average SAT scores in Mississippi higher than in California. Couples who live together before getting married are more likely to get divorced than couples who do NOT live together before getting married.