U.S. Federal Reserve Chair Janet Yellen said on Tuesday that investments in education and skills training are vital to address persistently high unemployment among lower-income and minority communities.

“Education levels have historically lagged in low- and moderate-income communities, particularly communities of color,” Yellen said in prepared remarks on workforce development to a conference in Washington.

The Fed chief did not mention monetary policy or the economic outlook in her speech. The central bank has repeatedly said that one of the barriers to both employment and growth is a lack of appropriate education and skills training.

The unemployment rate currently stands at 4.7 percent for the nation as a whole, which is near what many Fed officials consider full employment. However, that masks pockets of higher unemployment.

Unemployment rates averaged 13 percent in low- and moderate-income communities between 2011 and 2015, Yellen noted, compared to 7.3 percent in higher-income communities. Where minorities