Dow Jones Industrial Average Closes Lower, Goldman Sachs Group Inc (GS) Jumps 1.5% After Janet Yellen Speech

U.S. stocks struggled to hold on to gains Friday and closed lower as investors analyzed statements from Federal Reserve Chair Janet Yellen on the state of the U.S. economy ahead of the long Memorial Day weekend. Yellen said it would be appropriate for the central bank to raise interest rates this year if the economy continues to improve.