WASHINGTON (MarketWatch) -- Sales of new single-family homes plunged 14.5% to a seasonally adjusted annual rate of 384,000 last month, hitting the lowest level since July, with drops in three of four U.S. regions, the government reported Wednesday. Economists polled by MarketWatch had expected a March sales pace of 450,000, compared with an originally estimated rate of 440,000 in February. On Wednesday, the U.S. Commerce Department revised February's sales pace to 449,000. Economists caution over reading too much into a single monthly home-sales report. In March, the confidence interval for sales was plus or minus 12.9%.