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 table consists of four rows containing the following information from top to bottom, with row listed first and information listed second; row 1, East 36%; row 2, South 33%; row 3, Midwest 27%; row 4, West 56%. EastSouthMidwestWest36%33%27%56%
(a) Construct a 95% confidence interval for the proportion of adults from theWestWest