Question: 3. (5) Consider a regression on three explanatory variables,r, I, and I,. Consider two possible F-tests for (a) the joint significance of r, and I,-

3. (5) Consider a regression on three explanatory variables,r, I, and I,. Consider two possible F-tests for (a) the joint significance of r, and I,- (b) the joint significance off,, I, and Is- In which of these is the null hypothesis more likely to be rejected? Provide both an intuitive and a mathematical explanation
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