Also

* PricewaterhouseCoopers was accused in a lawsuit of helping defraud investors in Tyco International Ltd. The firm, Tyco’s outside auditor, was added as a defendant to a suit by pension funds and other shareholders claiming billions of dollars in losses.

* Kellogg Co. said it raised the average wholesale prices of its ready-to-eat cereals by 2% to help absorb the cost of rising commodity prices.

* SBC Communications Inc., a telephone company that has had nine straight quarterly sales declines, had the outlook on its investment-grade debt cut to “negative” from “stable” by Standard & Poor’s.

* Delta Air Lines Inc., the third-largest U.S. carrier, plans to start its new low-cost airline unit on April 15 to fight the growth of discount rivals on the East Coast.