Stocks ended a wobbly day with mixed results on Wall Street as markets continue to be unstable amid worries about a possible recession. The volatile trading came a day after the Dow Jones Industrial Average followed other major U.S. indexes into a bear market. The S&P 500 slipped 0.2%, the Dow fell a bit more and the Nasdaq composite wound up with a gain of 0.2%. With just a few days left in September, stocks are heading for another losing month as markets fear that the higher interest rates being used to fight inflation could help knock the economy into a downturn.