Directional Bias For The Day: S&P Futures are lower Near a support after turning down from a strong resistance; break below 2813.00 will be more bearish Odds are for down day with increased volatility – watch for break above 2828.75 for a change of fortunes Key economic data due: Prelim Nonfarm Productivity (-0.1% vs. 0.8% est.) at 8:30 AM Prelim Labor Cost (2.06% vs. 0.9%…