Exhibit 16-4
In a laboratory experiment, data were gathered on the life span (Y in months) of 33 rats, units of daily protein intake (X 1 ), and whether or not agent X 2 (a proposed life extending agent) was added to the rats diet (X 2 = 0 if agent X 2 was not added, and X 2 = 1 if agent was added.) From the results of the experiment, the following regression model was developed. Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 16-4. The degrees of freedom associated with SSR are
A)2
B)33
C)32
D)30

Question

Exhibit 16-4
In a laboratory experiment, data were gathered on the life span (Y in months) of 33 rats, units of daily protein intake (X 1 ), and whether or not agent X 2 (a proposed life extending agent) was added to the rats diet (X 2 = 0 if agent X 2 was not added, and X 2 = 1 if agent was added.) From the results of the experiment, the following regression model was developed.  Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 16-4. The degrees of freedom associated with SSR are
A)2 
B)33 
C)32 
D)30

Quizplus · Accepted Answer

The degrees of freedom associated with the sum of squares for regression (SSR) is equal to the number of independent variables in the model. In this case, it is 2.

Exhibit 16-4 In a Laboratory Experiment, Data Were Gathered on the Life