Develop a point estimate of the mean value of y when x1 180

Develop a point estimate of the mean value of y when x1 = 180 and x2 = 310 (to 3 decimals).
  

Develop a point estimate for an individual value of y when x1 = 180 and x2 = 310 (to 3 decimals).

Solution

For a point estimate of mean value of y plug in x1 and x2 values in the regression equation.

y = 29.1270+0.5906(180)+0.4980(310)

= 289.815

-----------------------------------------------------------------

Point estimate for individual value also is same as 289.815