13. In a pre-election poll, 400 of the 500 probable voters polled favored the incumbent. In this poll, the sample proportion, , of those favoring the challenger is a. 0.80 b. 0.20 c. 0.50

13. In a pre-election poll, 400 of the 500 probable voters polled favored the incumbent. In this poll, the sample proportion, , of those favoring the challenger is
a. 0.80
b. 0.20
c. 0.50

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