A survey of voter sentiment was conducted in four midcity political wards to compare the fractions of voters who favour candidate A. Random samples of 200 voters were polled in each of the four wards with the results shown in Table 14.9. The values in parentheses in the table are the expected cell counts. Do the data present sufficient evi- dence to indicate that the fractions of voters who favour candidate A differ in the four wards? 

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Voter Opinions in Four Wards Ward 1 2 3 4 Total Favour A 76 (59) 53 (59) 59 (59) 48 (59) 236 Total Do not favour A 124 (141) 200 147 (141) 141 (141) 152 (141) 564 200 200 200 800