Chevron Corp CVX.N fell 5.2% on downbeat fourth-quarter profit. By Stephen Culp NEW YORK, Jan 28 (Reuters) - The S&P 500 advanced on Friday, rebounding from selloff to rally and then paring gains near the end of a tumultuous week marked by heightened volatility as investors weighed mixed corporate earnings, geopolitical turmoil and an increasingly aggressive Federal Reserve. The Fed made it clear at the conclusion of its monetary policy meeting on Wednesday that they intend to take off their gloves and combat stubbornly persistent inflation by hiking key interest rates more aggressively than many market participants expected.