Dollar Weaker Vs Euro on Data Uncertainty  LONDON (Reuters) - The dollar eased from the previous day's  three-week high versus the euro on Tuesday as investors grew  cautious ahead of a series of key economic data due from the  United States this week. Recent U.S. data have been sending  mixed signals about economic recovery, contradicting upbeat  comments from Federal Reserve officials and fanning uncertainty  over the U.S. interest rate outlook.