Life Expectancy and TV again Exercise 4 revisted the relationship between life expectancy and TVs per capita and saw that re-expression to the square root of TVs per capita made the plot more nearly straight. But was that the best choice of re-expression. Here is a scatterplot of lige expectancy vs the logarithm of TV’s per capita. How can you tell that this re-expression is too far along the Ladder of Powers?

Life Exp 75.0 67.5 60.0 52.5+ -2.25 -1.50 Log (TVs per capita) -0.75