2. Identifying the general polynomial shape Example 1 General Rule: Basic polynomial function is one more that the number of direction changes.

3. Example 2 To enter data: STAT → Edit (Clear any data from lists – arrow up to L 1 hit clear – not delete. Enter x values in L 1 Enter f(x) values in L 2 2 nd STAT PLOT (Plot 1 on. Make sure L 1 & L 2 being used Graph (reset window settings, if needed) Determine # of direction changes (in this case 2) Stat → Calc → 6 (Cubic regression) OR Y = → Vars → 5(statistics) → EQ → RegEQ Verify that graph values are similar to table values.

4. Example 3 Follow the steps from Example 2. Let 1980 = Year 1, 1985 = Year 2, etc.

5. HW: Page 261