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 (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. 
= 36 + 0.8x1 - 1.7x2
Also provided are SSR = 60 and SST = 180.
-Refer to Exhibit 16-4. If we want to test for the significance of the model, the critical value of F at 95% confidence is
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Q104: An experimental design where the experimental units