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In 1965, about 44% of the Australian adult population had never smoked cigarett...
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In 1965, about 44% of the Australian adult population had never smoked cigarettes. A national health survey of 1205 Australian adults (presumably selected randomly) during 2006 revealed that 615 had never smoked cigarettes.
A 96% confidence interval for the proportion of Australian adults in 2006 that have never smoked is (use the large sample confidence interval procedure)0%
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