SEPT. 1 (Reuters) — U.S. stocks ended the day lower on worries about China’s economy and the timing of a U.S. interest rate hike. Investors now await new economic reports for signals that might influence the Federal Reserve. S&P Capital IQ’s Sam Stovall: “I think, data this week is fairly key, because we heard from three of the FOMC voting members last week, all of whom are a bit hawkish, and were saying, look, the […]