Researchers have found that statistically, there is a direct positive relationship between students' shoe sizes and their results on spelling tests and spelling bees. (That is, students with larger shoe sizes tend to do better.)
Can you explain this correlation?
Some children participate in spelling tests or spelling bees, whose feet grow larger as they become older. Older kids have better knowledge than young ones and they tend to to do better than their younger counterparts at these competitions.
Puzzle Solution
