Below you are given a partial computer output based on a sample of 8 observations, relating an independent variable (x) and a dependent variable (y).

                 Coefficient             standard error
Intercept      -9.462                          7.032
X                     0.769                          0.184

Analysis of variance
Source                    SS
Regression            400
Error (residual)      138

a.Develop the estimated regression line (to 3 decimals).
y ˆ = + x

b.At a = 0.05, test for the significance of the slope (to 2 decimals).
t =

c.At a = 0.05, perform an F test (to 2 decimals).
F =

d.Determine the coefficient of determination (to 3 decimals).

Explain the relationship between demand and unit price.
As unit price__________ demand___________.(increase or decreases)