Where can this S&P 500 pullback go? Wall Street analyst answers

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 710.93 -5.15 (0.72%)
Previous Close $716.08    52 Week High $119.66 
Open $712.09    52 Week Low $94.84 
Day High $714.94    P/E N/A 
Day Low $708.52    EPS $0.00 
Volume 33,328,186       

S&P DEP RECEIPTS (NYSE: SPY) Delayed: 762.60 -6.46 (0.84%)
Previous Close $769.06    52 Week High $219.60 
Open $765.96    52 Week Low $181.02 
Day High $768.15    P/E N/A 
Day Low $762.04    EPS $0.00 
Volume 45,486,186