Question

Which quadratic regression equation best fits the data set?

Answer 1

D.
`y=1.87x^2-5.16x+10.54`

Explanation:

The data set is given by,

x y

1 5.9

2 8.9

3 13.4

4 20.1

5 30.1

6 45.1

7 67.7

Using the regression calculator, we see that,

The quadratic equation that best fits the data is
`y=1.87x^2-5.16x+10.54` as shown below.

Thus, option D is correct.

Answer 2

The 4th selection is appropriate.

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Desmos.com has a wonderful graphing calculator. They also have apps for Android and iOS phones and tablets. Of course, your TI-83/84 or equivalent will do this, too.