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2 Number 2 (10 pts) Recall that R2 = $5E, where SSE is the explained sum of squares and SST is the total sum of

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Number 2 (10 pts) Recall that R2 = $5E, where SSE is the explained sum of squares and SST is the total sum of squares. (a) Explain which part of the variation in y that R2 measures, and justify your answer. (b) Why does R2 increase when explanatory variables are added

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