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The national health interview survey conducted of 33,326 adults by the u. s. national center for health statistics in 2003 indicated that 21.4% of adults were current smokers. a similar study conducted in 1991 of 42,000 adults indicated that 25.6% were current smokers. we will use the subscript "1" for the year 1991 and the subscript "2" for the year 2003. (a) find a point estimate of the difference between the proportion of current smokers in 1991 and the proportion of current smokers in 2003. use 3 decimal places
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1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25
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The national health interview survey conducted of 33,326 adults by the u. s. national center for hea...
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