U.S. stocks closed sharply higher Friday after the Chinese central bank cut interest rates and three tech giants posted better-than-expected earnings. The Dow Jones industrial average rose 157.54 points, or 0.9 percent, to 17,646.7. The S&P 500 index gained 22.64 points, or 1.1 percent, to 2,075.15. The Nasdaq Composite added 111.81 points, or 2.27 percent, to 5,031.86. For the week, the Dow rose 2.5 percent, the S&P 500 gained 2.1 percent and the Nasdaq jumped 3 percent.
