The table to the right shows the results of a survey in which 2556 adults from Country A, 1103 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

86%

Country C

94%

(a) Construct a 90% 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.)

b. Construct a 90% confidence interval for the proportion of adults from Country B who say human activity contributes to global warming.

 (Round to three decimal places as needed.)

C.  Construct a 90% confidence interval for the proportion of adults from Country C who say human activity contributes to global warming.

 (Round to three decimal places as needed.)

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