(Solution) - Construct a 95 confidence interval for the population proportion of -(2025 Original AI-Free Solution)

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Construct a 95% confidence interval for the population proportion of adults
(a) From the South who say that traffic congestion is a serious problem.
(b) From the West who say that traffic congestion is a serious problem.
Use the figure, which shows the results of a survey in which separate samples of 400 adults each from the East, South, Midwest, and West were asked whether traffic congestion is a serious problem in their community.