Stocks Down Slightly; Economic Data Mixed  NEW YORK (Reuters) - U.S. stocks ended slightly lower on  Friday as a higher-than-expected jump in U.S. producer prices  helped to offset a fall in oil prices and dividend hikes from  General Electric Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GE.N target=/stocks/quickinfo/fullquote"&gt;GE.N&lt;/A&gt; and SBC Communications &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SBC.N target=/stocks/quickinfo/fullquote"&gt;SBC.N&lt;/A&gt;.