Wild week for markets ends quietly

By Herbert Lash NEW YORK (Reuters) - A volatile ride for global markets this week ended calmly on Friday even as lingering worries over Chinese economic growth and the Federal Reserve's plans to raise interest rates weighed on stocks, but oil rebounded sharply for a second day. U.S. crude jumped more than 6 percent as a rally in gasoline prices and air raids in Yemen forced traders to scramble to cover short positions. The Fed is waiting to see how data and markets unfold over the coming weeks b