*See the documents attached. One of them is the graph I made.* * Describe the correlation between the age of the tree and the diameter of its trunk. Why do you think that the correlation is not perfect?
* Would you expect this line (the line of best-fit) to pass through the origin?
* What does the slope of your graph represent?

Extension Questions
1) Write an equation to link a tree's circumference with its likely age.
How old is a tree likely to be if its circumference is 157 cm?
2) What is the average annual increase in a tree's circumference?