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

East = 34%

South = 33 %

MIdwest = 27%

West = 55%

(a) Construct a95% confidence interval for the proportion of adults from the East who say traffic congestion is a serious problem. The95% confidence interval for the proportion of adults from the East who say traffic congestion is a serious problem is ( _ , _ )