The National Health Interview Survey (www.cdc. gov/nchs) estimated that current cigarette smokers were 41.9% of American adults

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The National Health Interview Survey (www.cdc. gov/nchs) estimated that current cigarette smokers were 41.9% of American adults in 1965 and 21.5% in 2003.

(a) Estimate the difference between the propor- tions who smoked in the two years.

(b) Suppose the standard error were reported as 0.020 for each proportion. Find the standard error of the difference. Interpret.

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