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Mathematics, 14.04.2020 22:45, kaylynnbryner04
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 and interpret a point estimate of the differencebetween the proportion of current smokers in 1991 and theproportion of current smokers in 2003.
b. A 99% confidence interval for the true difference is(0.032, 0.050). Interpret.
c. What assumptions must you make for the interval in (b) tobe valid?
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