Fed Chair Powell Sees Core PCE At 3.2% Ending In March; Near-Term Inflation Expectations Have Risen; Long-Term Inflation Expectations Consistent With 2%; Economic Outlook Remains Highly Uncertain, Conflict In M. East Adds To Inflation; Higher Energy Prices Will Push Up Near Term Inflation; Well-Positioned; Policy Not On Preset Course; Says My Last Press Conference As Chair, Congratulates Warsh On Advancement