PRECIOUS-Gold slips, poised for weekly loss on strong U.S. data, dollar

* Bullion dips for third session on strong economic data * U.S. stock futures down after Ebola case in New York City * Dollar set for weekly gain after two weeks of losses (Updates prices) By A. Ananthalakshmi SINGAPORE, Oct 24 (Reuters) - Gold dipped for a third session in a row on Friday and was set to snap a two-week winning streak as a firmer U.S. dollar and robust economic data dented the metal's appeal as a hedge. Bullion's dip comes despite a tumble in U.S. stock fut