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Construct a 95% confidence interval for the population proportion of adults
(a) From the East who say that traffic congestion is a serious problem.
(b) From the Midwest 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. |
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