Exhibit 13-12
In a laboratory experiment, data were gathered on the life span Y in months) of 33 rats, units of daily protein intake X1), and whether or not agent X2 a proposed life extending agent) was added to the rats diet X2 = 0 if agent X2 was not added, and X2 = 1 if agent was added.) From the results of the experiment, the following regression model was developed.
$\hat { Y }$ =36+0.8X1 - 1.7X2
Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 13-12. The life expectancy of a rat that was not given any protein and that did not take agent X2 is
A) 36.7
B) 34.3
C) 36
D) 38.4

Question

Exhibit 13-12
In a laboratory experiment, data were gathered on the life span Y in months) of 33 rats, units of daily protein intake X1), and whether or not agent X2 a proposed life extending agent) was added to the rats diet X2 = 0 if agent X2 was not added, and X2 = 1 if agent was added.) From the results of the experiment, the following regression model was developed.
 $\hat { Y }$ =36+0.8X1 - 1.7X2
Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 13-12. The life expectancy of a rat that was not given any protein and that did not take agent X2 is
A) 36.7
B) 34.3
C) 36
D) 38.4

Quizplus · Accepted Answer

The life expectancy is calculated by substituting X1 = 0 and X2 = 0 into the regression equation: $\hat{Y} = 36 + 0.8(0) - 1.7(0) = 36$.

Exhibit 13-12 in a Laboratory Experiment, Data Were Gathered on the Life

Exhibit 13-12
in a Laboratory Experiment, Data Were Gathered on the Life