US STOCKS-Wall St starts December on positive note
* November factory activity, auto sales expected
* Chicago Fed's Evans to speak later in the day
* Mattress Firm up after agreeing to buy Sleepy's owner
* Indexes up: Dow 0.57 pct, S&P 0.61 pct, Nasdaq 0.50 pct (Updates to open)
By Tanya Agrawal
Dec 1 (Reuters) - Wall Street kicked off the last month of the year on a positive note as investors await data and policy decisions by central banks.
A barrage of data is expected later in the day, including U.S. factory activity data for November at 10 a.m. ET (1400 GMT), which is expected to tick up. The Department of Commerce is likely to report a slight dip in construction spending for October and automakers will report sales figures for November.
U.S. auto sales are expected to rise above 18 million vehicles on an annualized basis for November, continuing the pace for record sales in 2015.
Investors are keeping an eye on data for clues regarding the health of the U.S. economy that might enable the Federal Reserve to raise interest rates for the first time in nearly a decade. Continuación...