US STOCKS-Wall St slips as Yellen says Dec hike "live" possibility
* Oct private sector jobs growth better than forecast
* Tesla rises after co reassures on production pace
* Groupon shares sink on weak revenue forecast
* Indexes down: Dow 0.17 pct, S&P 0.22 pct, Nasdaq 0.16 pct (Adds details, changes comment, updates prices)
By Abhiram Nandakumar
Nov 4 (Reuters) - Wall Street was lower on Wednesday morning after Federal Reserve Chair Janet Yellen said a rate hike in December was a "live" possibility, but not a certainty.
The Fed is "expecting the economy will continue to grow at a pace to return inflation to our target over the medium term," Yellen told Congress.
"If the incoming information supports that expectation ... December would be a live possibility" for a rate increase.
A raft of data on Wednesday suggested the economy was strong enough to support an interest rate hike. Continuación...