Economists forecast that new-home sales rose 1.6 percent last month to a seasonally adjusted annual rate of 515,000, according to a survey by data firm FactSet. Nearly 3 million more Americans have found jobs in the past year and mortgage rates remain low by historical standards. Federal Reserve Chair Janet Yellen said last week that she expects the housing market to keep improving as more people find jobs and younger Americans increasingly move out on their own. [...] low mortgage rates are keeping home purchases affordable for many would-be buyers.