Wall Street set for higher open; Yellen in focus

Wall Street was set for a higher open on Monday as investors await Federal Reserve Chair Janet Yellen's speech after a weak jobs report jolted markets on Friday, killing the prospects of an interest rate hike this month. Yellen, who recently signaled that the recovering economy could support a rate hike as soon as June, will speak before the World Affairs Council in Philadelphia at 12:30 p.m. ET (1630 GMT). Expectations for the next Fed rate hike were pushed back to at least July after U.S. May