US STOCKS-Wall St falls after weak Chinese data; Fed meeting eyed
* China investment, factory output miss expectations
* U.S. Fed to meet Wednesday and Thursday
* Apple up after iPhone pre-orders set to beat record
* Indexes down: Dow 0.49 pct, S&P 0.54 pct, Nasdaq 0.45 pct (Updates prices, adds commentary)
By Sinead Carew
Sept 14 (Reuters) - U.S. stocks were lower on Monday afternoon as some investors stayed on the sidelines ahead of the Federal Reserve's policy meeting this week and others worried about slowing growth in China after weak data.
Stocks are expected to remain volatile before a Federal Reserve announcement scheduled for Thursday after a two-day meeting at which it will decide whether or not to make its first interest rate increase since 2006.
"It's a quiet one today. With the Fed coming out Thursday nobody wants to take any real shots," said Michael Matousek, head trader at U.S. Global Investors Inc in San Antonio.
A broad group of economists polled by Reuters last week bet on a September move by a slim margin; economists at banks that deal directly with the Fed, known as primary dealers, picked December as more likely; and traders of short term interest rate futures were giving a rate rise this week only a one-in-four chance. Continuación...