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A mayor is concerned about the percentage of city residents who express disapproval of his job performance. His political committee pays for a TV ad.

A mayor is concerned about the percentage of city residents who express disapproval of his job performance. His political committee pays for a TV ad. They take a poll of 100 people afterward to test the claim that the TV ad has dropped his disapproval below 32%. If the poll showed that his disapproval decreased to 28%, calculate the test statistic.

-2.8

0.86

-0.86

-1.03

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