The table to the right shows the results of a survey in which 400 adults from th

Question

The table to the right shows the results of a survey in which 400 adults from the East, 400 adults from the South, 400 adults from the Midwest, and 400 adults from the West were asked if traffic congestion is a serious problem. Complete parts (a) and (b). (a) Construct a 99% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem. The 99% confidence interval for the proportion of adults from the West who cay traffic congestion is a serious problem is (, ). (Round to three decimal places as needed.)

Explanation / Answer

Sample Proportion = 0.53

Margin of error = 2.5758*Sqrt(0.53*0.47/400) =0.06428

99% Interval

(0.53-0.06428, 0.53+0.06428)

( 0.256, 0.384)

So , answer is (0.256, 0.384)

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