US STOCKS-Wall St slips on rate uncertainty; Apple up after the bell
* Nasdaq 100 futures rise after Apple results; crude oil lower; energy shares slip
* Rite Aid surges on reports Walgreens in buyout talks
* Indexes down: Dow -0.2 pct, S&P -0.3 pct, Nasdaq -0.1 pct (Updates close with Apple shares up after the bell, latest volume)
By Caroline Valetkevitch
Oct 27 (Reuters) - U.S. stocks slipped on Tuesday on uncertainty over the U.S. rate outlook and disappointing results from Ford and other companies.
Upbeat results from Apple after hours, however, could give the market a boost on Wednesday.
Shares of Apple, the biggest company by market capitalization, rose 2.8 percent to $116.89 after it reported higher-than-expected earnings and revenue. Apple's stock ended the regular session down 0.6 percent at $114.55.
Nasdaq 100 e-mini futures also edged up after Apple's results.
"Both earnings and revenues were above expectations, which I think was well embraced based on the fact that a lot of companies have been struggling on the top line," said Daniel Morgan, senior portfolio manager at Synovus Trust Company, which owns Apple shares. Continuación...