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

question 54

Multiple Choice

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 3 units of protein daily, and who took agent X₂ is

• A)36.7
• B)36
• C)49
• D)38.4

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