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NE>V, .YORK, March 4 ÛÓ The stock market rebounded' today as automakers reported that rebates have helped sales but the government provided figures indicating the economy may be slowing.	*></br></br>The Dow Jones average of. 30 industrials, which had fallen 11.97 points the-previous day, rose 5.42 to points 971.44. Advances outnumbered declines by 8 to 7 on the New York Stock Exchange.</br></br>Automakers,- suffering from poor sales and large losses, 'turned to the temporary price cuts- in an effort to boost sales, and today all the domestic companies except Û¢ Ford Motor Co. reported that, late-February sales were higher than a year earlier.</br></br>The economy has been growing in the early months of 1981. but most economists expect a slowing later in the year. Evidence to support that view came from the. Commerce Department, which said new factory orders fell 0.3 percent in January after rising 2.1- percent in December.</br></br>The rebates boosted General MotorÛªs daily selling rate to its highest ever for a late February, and GM stock rose 'A to 49Û÷/h. Chrysler was unchanged at 5hi, and Ford was unchanged at 20 '4.