The National Health Interview Survey conducted of 33,326 adults by the U.S. Nati

Question

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

Explanation / Answer

a) Point estimate of the difference between the proportion of current smokers in 1991 and the proportion of current smokers in 2003

= 0.256 - 0.214

= 0.042

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