The table to the right shows the results of a survey in which 400 adults from the East,400adults from theSonth,400adults from the Midwest, and400adults from the West were asked if traffic congestion is a serious problem. Complete parts (a) and (b). Table East 34%, south 31%, Midwest 25%, West 53% (a) Construct a 99% confidence interval for the proportion of adults from the Eastwho say traffic congestion is a serious problem. The 99% confidence interval for the proportion of adults from the Eastwho say traffic congestion is a serious problem i539 ( L ( ). (Round to three decimal places as needed,]