Population Growth - Quadratic or Exponential ?

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Population Growth - Quadratic or Exponential ?
What will the population be in 3000?
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Collect Data
1. Go to internet Try www.census. popclock
or www.census.gov/population 2. Pick a
State 3. Find Population for years 1900-2000
Let x01900, x11910
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Plotting Manually
1. Graph all ordered pairs. 2. X-values
represent the years. 3. Y-values represent the
population. 4. Connect the curve with a smooth,
continuous motion.
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Plotting Using the TI-83
Key Strokes 1. List 1 2 2. Stat Plot 3. Zoom
Stat 5. Stat 6. Quit 7. Calc 8. Regression 9.
Y1 10. Vars 5 11. EQ 12. Reg EQ
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What Happened?
1. A Quadratic Regression ? 2. An
Exponential Regression?
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Line of Best Fit
Really, theres not much difference. Can both
answers be correct? Oh, me, oh my - no wonder
math is hard!
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Predictions
According to these models, what might the
population be in 3000? 1. Try putting ____ in
for x in both equations? 2. Why that number? 3.
What could effect this model?