The National Health Interview Survey (www.cdc .gov/nchs) estimated that current cigarette smokers were 42% of American adults
Question:
The National Health Interview Survey (www.cdc
.gov/nchs) estimated that current cigarette smokers were 42% of American adults in 1965 and 20% in 2014.
(a) Estimate the difference between the proportions 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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