The University of Southern California has opened an investigation into allegations that Paige Laurie hired another student to do her classwork for her for more than three years. The new basketball arena at the University of Missouri in Columbia is named for her, although she never attended that University. A USC spokesman says the investigation stems from last Friday night’s report on the ABC newsmagazine 20-20 that featured Laurie’s former college roommage, who says she was paid $20,000 for the work. The Laurie family has refused to comment on the allegations.