$\"\"$

Graph the linearized data :

$\"\"$

Observe the above graph :

The data suggest that there are two turning points.

The regression equation of the linearized data is $\"\"$ .

Thus, a cubic function is a better representation than a quadratic function.

From the regression model, we will calculate the value of $\"\"$ .

The value of $\"\"$ for cubic function and $\"\"$ for quadratic function.

Therefore, the model should be $\"\"$ .

$\"\"$

Coleen $\"\"$ s is correct.