Wall Street ended the week with a choppy trading session. Early gains gave way to mid-day selling. The Dow, S&P 500 and Nasdaq finished lower. Looking at the action for the week: The Dow fell for the first time in three weeks. But the Nasdaq posted a gain. Investors had a hard time overlooking mixed signals from the consumer. JC Penney slashed its outlook for the quarter - saying its core, middle-income shoppers are being squeezed by economic conditions. And consumer sentiment tumbled to a 16-year low, according to the Reuters-University of Michigan final reading for March. But not all news on the consumer was bad. Americans had more money to spend in February, according to government statistics. And a key measure of consumer inflation saw a minor rise. Looking at the retailers: JC Penney was down sharply and other mid-tier department stores like Kohl's and Macy's - down as well. Financials were another sore spot. Citigroup is expected to swing to a quarterly loss amid...