Directional Bias For The Day: S&P Futures are lower The odds are for a down day with good chance of sideways to up move from pre-open levels near 3100.00;  elevated volatility – watch for break above 3144.75 for change of sentiments Key economic data due: Core PPI (-0.1% vs. -0.1% est.; prev. -0.3%) at 8:30…