Stocks ended mixed Thursday as some positive economic data were partially offset by Apple's (AAPL) disappointing earnings report. The Nasdaq, weighed by Apple's big loss, fell 0.7%. The Dow Jones industrial average climbed 0.3%, while the S&P 500 ended virtually flat. Volume climbed on both major exchanges, according to preliminary data, but some of Nasdaq's turnover surge can be traced to one high-profile stock. Initial jobless claims fell to