The table shows the results of a survey in which separate samples of 400 adults

Question

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 East who say traffic congestion it a serious problem. The 95% confidence interval for the proportion or adults from the East who say traffic congestion is a serious problem is (b) Construct a 95% confidence interval for the proportion of adults from the South who say traffic congestion is a serious problem. The 95% confidence interval for the proportion of adults from the south who say traffic congestion is a serious problem is

Explanation / Answer

a) East = 34%

Proportion of positive results = P = x/N = 0.340

Lower bound = P - (Z*SEM) = 0.247

Upper bound = P + (Z*SEM) = 0.433

b) South = 31%

Proportion of positive results = P = x/N = 0.310

Lower bound = P - (Z*SEM) = 0.219

Upper bound = P + (Z*SEM) = 0.401

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