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).

TABLE

Region Percentage East 37% South 33% Midwest 28% West 53%

(a) Construct a 95% confidence interval for the proportion of adults from the Midwest who say traffic congestion is a serious problem.The 95% confidence interval for the proportion of adults from the Midwest who say traffic congestion is a serious problem is (),()

(b) Construct a 95% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem. The 95% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem is (),()