Question

What is the quadratic regression equation?

x 54 81 15 26 30 41 70 92 61
y 143 80 19 64 83 137 99 25 126

Round each coefficient in the equation to the nearest thousandth.

Answer 1

y = -0.078 x² + 8.407 x − 92.892

Explanation:

Use a calculator or spreadsheet to find the least squares regression equation.

Answer 2

y = -0.078x^2 +8.407x -92.892

Explanation:

Any of various graphing calculators, spreadsheets, or statistical analysis tools can give you the coefficients for a quadratic regression.

Attached is the output of a graphing calculator. Rounded to thousandths, the equation is ...

y = -0.078x^2 +8.407x -92.892