Question

The data set represents a bimonthly progression of gasoline prices over the course of several months in an unspecified city. Use a graphing calculator to determine the quadratic regression equation for this data set.
x
0
2
4
6
8
y
2.86
2.89
2.93
3.04
3.11

Answer 1

Plugging in the data points into a quadratic regression application, we get the following regression:

y = ax^2 + bx + c,
where:
a= 0.00267857
b= 0.0110714
c= 2.85743
with an R² value of 0.9851