S&P 500 ends lower after another wild ride

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 725.51 --0 (-0%)
Previous Close $725.51    52 Week High $119.66 
Open $725.51    52 Week Low $94.84 
Day High $725.51    P/E N/A 
Day Low $725.51    EPS $0.00 
Volume 1,475,167       

S&P DEP RECEIPTS (NYSE: SPY) Delayed: 754.95 --0 (-0%)
Previous Close $754.95    52 Week High $219.60 
Open $754.95    52 Week Low $181.02 
Day High $754.95    P/E N/A 
Day Low $754.95    EPS $0.00 
Volume 768,372