Question

Why can’t we just look at SSreg (sum of squares regression) to decide whether to add...

Why can’t we just look at SSreg (sum of squares regression) to decide whether to add a new variable (following the rule if SSreg gets bigger, add the new variable)?

Why do you think partial tests are useful for telling us whether we should add a new variable?

Please provide a detailed explanation

Math   Statistics-And-Probability   
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