The table below shows the results of a survey in which 2556 adults from Country? A, 1107 adults from Country? B, and 1060 adults from Country C were asked if human activity contributes to global warming.
Complete parts? (a), (b), and? (c).
Adults who say that human activity contributes to global warming
Country A ----67?%
Country B----88%
Country C----94?%
?(a) Construct a 99?% confidence interval for the proportion of adults from Country A who say human activity contributes to global warming.
( ? , ? )
?(Round to three decimal places as? needed.)