Psych 101: Correlation & Causation

What is the MAIN reason why babies who drink bottled water are healthier?

Parents have more money for health care and are likely more conscientious in general.

What is the MAIN reason why children with longer arms reason better than children with shorter arms?

They are older.

Why are ice cream sales correlated with drowning deaths?

Hot weather causes both.

Why do older women have higher feet-angles (i.e. toes pointed away from each other) than younger women?

Because they were taught to walk that way when they were young, to walk like a ballerina.

What is the MAIN reason cigarettes are negatively correlated with GPA?

Cigarettes tend to go along with lifestyles (drugs. drinking, recklessness) that does nor produce high GPAs.

Historically, the price of vodka is correlated with the salaries of dock workers. Why is this so?

Inflation

What is the MAIN reason why United States Senators have higher life expectancies than average?

Because they have to live long enough to become Senators and that makes their life expectancy higher.

Name exactly two reasons why cancer death rates are higher in richer countries. Only the first two answers will be graded.

1. Better diagnosis.
2. Longer lives to get cancer