In 1965, about 44% of the US popuation had never smoked a cigarette. A nation survey of 1205 US adults during 2006 revealed that 615 had never smoked. Suppost a 95% confidence interval is (0.48215, 0.5386). Can we conclude from the confidence interval that the proportion of US adults that has never smoked has changed since 1965? how can you tell?