【非選題】 4. (10%) A survey is performed to study the proportion of residents in City A and City B who support the construction of a new railway line. It is found that 680 of 1000 City A residents favor the construction while 730 of 1000 City B residents are in favor. Is there a significant difference between the proportions of City A and City B residents who favor the construction of the new railway line? Use the P-value approach to help your draw your conclusion. Use 0.05 as the level of significance.
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