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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).

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 (  ,  ). (Round to three decimal places as needed.)
(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 ( , ). (Round to three decimal places as needed