Question

Using the data from question #1, what is the equation of the line of best fit? (For future reference: line of best fit, linear regression equation, and least-squares line are all the same thing y=ax+b). Round your answers to the nearest tenth.
x : {20,30,45,60,80,90,45,120,90,70} y: {50,45,55,70,80,90,80,100,95,85}

Answer 1

You can solve this manually by plotting all points, fitting a line, finding its intercepts and obtaining the equation.

For the easier solution, use Mode STAT in your scientific calculator, input the x and y values, and find the m and b parameters for equation y = mx + b

The equation of the best fit line would be: y = 0.57x + 38.15