Question

The data set represents a month-to-month 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.

Answer 1

The correct option is a.

Explanation:

The general form of a quadratic regression equation is

`y=ax^2+bx+c` ..... (1)

Using graphing calculator we get

`a=-0.143393\approx -0.143`

`b=0.59525\approx 0.595`

`c=2.82964\approx 2.830`

Substitute these values in equation (1) to find the quadratic regression equation for this data set.

`y=-0.143x^2+0.595x+2.830`

Therefore the correct option is a.