Candidates accused the federal regulatory agency of playing politics.
Yellen spoke a week after the Fed delayed a long-anticipated rate hike.
Yellen appeared to lose her place and stopped several times during a speech in Amherst.
The U.S. central bank said an array of global risks and other factors had convinced it to delay the hike.
After months of speculation, federal policymakers could raise interest rates on Thursday.
Monetary policy should be based on long term factors, not a quick fix for sudden market movements.
The steadily improving U.S. jobs market could open the door wider to a Federal Reserve interest rate hike in September.
The unemployment rate fell two-tenths of a percentage, the lowest since April 2008.
Fed says the economy is now on track to grow between 1.8 percent and 2.0 percent this year.
The confidential information provided Goldman a window into the New York Fed's private insights, the New York Times reported
The final rule, required by the 2010 Dodd-Frank Wall Street reform law, is designed to prevent "too big to fail."
The minutes showed the Fed participants "generally agreed" that its monthly bond purchases would end in October