The stock market slumped Friday as investors contended with mixed signals from the Federal Reserve amid signs of a resilient U.S. economy.The $DJIA(.DJI)$ fell 292 points, or 0.9%, while the $S&P 500(.SPX)$ dropped 1.3%, and the $NASDAQ(.IXIC)$ slumped 2%. All three indexes finished the week lower, ending four consecutive weeks of gains for the S&P 500 and the Nasdaq.Stocks closed with modest gains Thursday after U.S. jobless claims unexpectedly fell during the week ended Aug. 13, the first decline since late July, suggesting the labor market remains strong. The Philadelphia Federal Reserve’s monthly manufacturing index also sur