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The table to the right shows the results of a survey in which

2559 adults from Country​ A,
1118 adults from Country​ B, and
1077 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 Upper A
Country A

60​%
Country Upper B
Country B
86​%
Country Upper C
Country C
92​%
​(a) Construct a
99​% confidence interval for the proportion of adults from
Country Upper A
Country A who say human activity contributes to global warming.