U.S. markets and stock exchange traded funds were mixed Friday as technology stocks regained some of their lost ground. On Friday, the Invesco QQQ Trust (NASDAQ: QQQ) was up 1.2%, SPDR Dow Jones Industrial Average ETF (NYSEArca: DIA) fell 0.7%, and iShares Core S&P 500 ETF (NYSEArca: IVV) was...