For my project, I compared a human's arm length (in inches)(right arm)(from finger tips to shoulder) and leg length (in inches)(right leg)(from the bottom of the foot to the hip). I was curious to see how much longer (on average) a person's leg was than their arm. I found that, on average, a person's leg is about 10-13 inches longer than their arm. My initial prediction was actually really close to the outcome. The equation above (y= .58x + 21.26) is true only up to a certain point. Only after about 20 inches in leg length does this slope work. The y intercept might only work if someone has short legs and no arms. The line doesn't go on forever either.
How do you explain the equation y = .58x + 21.26? Why does it work only to a certain point?
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