Stocks finished with big gains Friday, posting their best day in six sessions. Blue chips led, with the Dow Jones industrial average rising 1.6%, while the S&P 500 climbed 1.3% and the Nasdaq finished 1.0% higher. Preliminary data show volume coming in lower than yesterday across the board. The Nasdaq finished the week down fractionally, after trimming the majority of a 3.7% loss at its low for the week.