uring an election, Kevin and Britney took a poll of 1,200 voters, and asked what the most significant issue was in the upcoming election. They found 780 of the voters answered the economy. They wanted to find the 90% confidence interval for the population proportion of voters who feel the economy is the most important. Kevin remembered from his Statistics class that the graphing calculator would be a helpful tool to do this. Britney said they needed to use the 1-PropZInt.

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