Taller children tend to be able to read at a higher level. however, there is a very significant confounding variable that is influencing both height and reading ability. what is it

The correct answer is The age of the child is a significant confounding variable that influences both height and reading ability.

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.