The table shows the results of a survey in which separate samples of 400 adults each from the East, South,Midwest, and West were asked if traffic congestion is a serious problem in their community. Complete parts (a) and (b).

Region Percentage

East 34%

South 33%

Midwest 26%

West 54%

(a) Construct a 95% confidence interval for the proportion of adults from the South who say traffic congestion is a serious problem. The 95% confidence interval for the proportion of adults from the South who say traffic congestion is a serious problem is ( _____, ____). (Round to three decimal places as needed.)