NEW YORK,  — Oil prices plummeted Tuesday after a three-day’s big gain. Market tumbled as a renewed selloff around the world’s equity markets made investors nervous. Chinese shares slumped for a second day Tuesday on weak economic data, with the benchmark Shanghai Composite Index dipping 1.23 percent. China’s manufacturing purchasing managers’ index (PMI) came in at 49.7 in August, down from 50 for July and the lowest since August 2012, according to official data released Tuesday morning.(Xinhua)…[+]