Stocks Slip, Investors Wary Before Intel  NEW YORK (Reuters) - U.S. stocks slipped on Tuesday as  investors showed caution ahead of tech bellwether Intel Corp.'s  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=INTC.O target=/stocks/quickinfo/fullquote"&gt;INTC.O&lt;/A&gt; earnings, while disappointing results from State  Street Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=STT.N target=/stocks/quickinfo/fullquote"&gt;STT.N&lt;/A&gt; cast a cloud over the banking sector.