U.S. corporations to report best and worst of times

By Rodrigo Campos NEW YORK (Reuters) - Stock market investors who spent January swayed by oil prices, economic weakness in China and central bank speculation may continue to do that next week, even though it should be a dramatic one for earnings reports and economic data. Fourth-quarter 2015 earnings reports coming from Internet leader Alphabet and Exxon Mobil , an old-economy company hit by falling oil prices, will spotlight the yin and yang of Corporate America. If shares of Alphabet, Google's