* FedEx jumps after lifting quarterly dividend by more than 50%
* Oracle rises as sales, profit top estimates on cloud boom
* Continental Resources jumps on buyout proposal from founder (Updates to mid-afternoon, changes byline)
By Chuck Mikolajczak
NEW YORK, June 14 (Reuters) – The S&P 500 ended lower on Tuesday as the index was unable to bounce from a sharp sell-off in the prior session with a key policy statement from the Federal Reserve on deck that will reveal how aggressive the central…
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