Yellen And Jobs Report: Last Two Hurdles To US Hike

The US dollar is narrowly mixed as Yellen's speech in Chicago is awaited.   The greenback's three-day advance against the euro and four-day advance against the yen is at risk.  Sterling, however, is lower for the sixth session,  following the weaker than expected service PMI (53.3 vs. 54.5 in January and 54.1