2.8 Polynomial Models in the Real World

•Use data and write a function to represent the data.

•Analyze which model fits data the best.

Model Data with a Polynomial FunctionGet out your TI-84 and turn it on.

1. Press the “STAT” button.

2. Under the first heading “EDIT” selection option “1 Edit” and push enter.

3. Delete all of the entries in each list (L1, L2, …). Put the curser over an entry and push delete.ORPut the curser over the list heading at the top like”L1” and push clear and then enter. Do not push delete (the entire L1 list will be deleted)

4. Now that your lists have been deleted you need to enter your new information. Put the x into L1 and the y into L2. Also, if you are entering years like 1990 and 1992, then you would enter 90 and 92.

5. Now that your list is entered push “STAT” and go to the second heading of “CALC”.

6. Under “CALC” you will choose options: 4 LinReg (to see if it is a straight line), 5 QuadReg (to see if it is a quadratic), 6 CubicReg (to see if it is cubic).

7. Choose the model with r2 closest to 1.

8. Use the numbers given for a , b, c and ….etc to write your equation.

2.8 pg. 124 – 127 # 9 – 12, 14, 16 – 19