Fed meeting grabs spotlight amid volatility comeback

Stock investors next week will focus on the Federal Reserve's monetary policy decision and whether economic growth trends have given the U.S. central bank reason to raise interest rates off of rock-bottom levels. In the days leading up to Wednesday's policy announcement, market volatility has spiked following two months of relative calm. In the last six trading sessions, the benchmark S&P 500 has moved at least 1 percent four times, twice up and twice down, whipsawed by shifting perceptions