If The Shoe Fits, Who Needs a Formula
In 1979, the mathematics education journal VECTOR published an article with this formula...
A Formula for Determining Shoe Size
Men: N = 3L  25
Women: N = 3L  22
Where L = Your foot length in inches
Task 1: Graph both of these equations on a common graph. Do they make sense? Explain.
Task 2: Devise an experiment to collect data to test the validity of these equations. Also, is it necessary to incorporate age as a factor?
Task 3: Using the Internet, search for both formulae and conversion charts for turning foot length into shoe size. Do they agree with the previous formula?
Note: This formula was published in 1979. Do you think things regarding this formula have changed in the past 35 years?
As a side note, someone once posed the following to predict someone's age from their shoe size...
 Ask the person to multiply their shoe size by 5
 Add 50
 Multiply by 20
 Add 1014 (Last 2 digits must be the last two digits of the current year)
 Subtract the year you were born
 Ask for the person's current result. The first 2 digits are their shoe size and the last 2 digits are their age. Right?
