Fed jitters and oil pressure Wall Street; Apple rallies

Wall Street edged lower on Wednesday as investors focused on future interest rate hikes and as cheaper oil dragged down energy shares, although Apple surged to its highest level this year. Speculation about the timing of the Federal Reserve's next interest rate hike has shaken major stock indexes since last Friday following contrasting comments from Fed officials. The S&P 500 remains down almost 3 percent from before Friday's steep selloff, even though interest rate futures indicate expectat