Answer
Plotting the points given by the dataset,
we see that the points do not suggest a concave up,
nor a concave down curve, if we observe the whole range of the dataset.
It does not suggest a parabola as an approximation, so a quadratic model would not be a good one.
The suggested curve would be a polynomial of higher (third) degree.
Work Step by Step
No steps involved. The answer contains the needed explanations.
