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. Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 13-12. The life expectancy of a rat that was given 2 units of agent X₂ daily, but was not given any protein is

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.

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 (X<sub>1</sub>) , and whether or not agent X<sub>2</sub> (a proposed life extending agent) was added to the rats diet (X<sub>2</sub> = 0 if agent X<sub>2</sub> was not added, and X<sub>2</sub> = 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 13-12. The life expectancy of a rat that was given 2 units of agent X<sub>2</sub> daily, but was not given any protein is A) 32.6 B) 36 C) 38 D) 34.3

Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 13-12. The life expectancy of a rat that was given 2 units of agent X₂ daily, but was not given any protein is

Quizplus · Accepted Answer

To find the life expectancy of a rat that was given 2 units of agent X₂ daily, but was not given any protein, we need to substitute X₁ = 0 and X₂ = 2 in the equation: Y = 25 + 1.5X₁ + 4X₂ Y = 25 + 1.5(0) + 4(2) Y = 25 + 8 Y = 33 Therefore, the life expectancy of a rat is 33 months.

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