Adversarial: A college basketball player who wants to get drafted early and signed to a big contract grows his hair up, so that NBA teams will measure him as being taller (up to the top of his hair).
Height is correlated with basketball ability.
Regressional: But the best basketball player in the world (according to the NBA MVP award) is just 6'3" (1.91m), and a randomly selected 7 foot (2.13m) tall person in his 20s would probably be pretty good at basketball but not NBA caliber. That's regression to the mean; the tails come apart.
Extremal: The tallest person on record, Robert Wadlow, was 8'11" (2.72m). He grew to that height because of a pituitary disorder, he would have struggled to play basketball because he "required l... (read more)