U.S. Stocks End Choppy Session Lower On Rate-hike Worries

U.S. stocks ended Friday's choppy session slightly lower, though the S&P 500 and Nasdaq Composite booked modest gains over the week. Stocks sold off toward the end of the session, after Federal Reserve Chairwoman Janet Yellen said she still expected the central bank to raise interest rates sometime this year, in a speech in Providence, R.I., discussing the U.S. economic outlook. The S&P 500 closed 4.76 points, or 0.2%, lower at 2,126.06, but gained 0.2% over the week. The Dow Jones Industrial Average closed 53.72 points, or 0.3%, lower to 18,232.02 and ended the week with a 0.2% loss. The Nasdaq Composite index ended the session down 1.43 points at 5,089.36, but posted a 0.8% gain over the week.