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 Bad Traffic Congestion? each trom the East South, Midwest and West were asked it traffic congestion is an serious problem in their community Complete parts (a) and (b) 35/ S6 (a) construct a 95% confidence nterval for the proportion of aduls tom te West who say traffic congestion is a senous problem The 95% confidence interval for the proportion of adults from the west who say traffic congestion a serious problem s (Round to three decimal places as needed.) (D)Construct a 95% confidence rterval for the proportion of adults tom the Midwest who say traffic congestion is a serious The 95% confidence interval for the proportion of adults tom te Midwest who say tramc con eston s a serious problem s (Round to three decimal places as needed.)

Explanation / Answer

(A)

(B)

p 0.5600 n 400.0000 SE = sqrt(p*(1-p)/n) 0.0248 z 1.9600 ME = z*SE 0.0486 Lower bound = p - ME 0.5114 Upper bound = p + ME 0.6086

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