posted by Anonymous .
An insurance firms wants to examine the relationship between text messages per day and insurance claims. The following data is a sample of 5 participants:
Cellphone Texts per day (X) Insuance Claims ($$) (Y)
Choose the correct Estimated Regression Equation.
If you need to show the work by hand, you can develop the regression equation in the following format:
predicted y = a + bx
...where a represents the y-intercept and b the slope.
To get to that point, here are some formulas to calculate along the way.
To find a:
a = (Ey/n) - b(Ex/n)
Note: E here means to add up or to find the total.
To find b:
b = SSxy/SSxx
To find SSxy:
SSxy = Exy - [(Ex)(Ey)]/n
To find SSxx:
SSxx = Ex^2 - [(Ex)(Ex)]/n
I hope this will help get you started.