In a laboratory experiment, data were gathered on the life span(Ymiddotin months

Question

In a laboratory experiment, data were gathered on the life span(Ymiddotin 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. Y = 36 + 0.8X_1 - 1.7X_2 Also provided are SSR = 60 and SST = 180. Refer to Exhibit 16-4. From the above function, it can be said that the life expectancy of rats that were given agent X_2 is 1.7 months more than those who did not take agent X_2 1.7 months less than those who did not take agent X_2 0.8 months less than those who did not take agent X_2 0.8 months more than those who did not take agent X_2

Explanation / Answer

Option B is correct . If X2 = 1 then Y is 1.7 less than when X2 = 0, So Correct option is B

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