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Prior to an upcoming election, voters are polled on whether or not they support using a new tax to support building playgrounds in the community.

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Prior to an upcoming election, voters are polled on whether or not they support using a new tax to support building playgrounds in the community. If 400 out of 870 voters support the new tax, construct a 90% confidence interval estimate for the proportion of all voters who support the tax. The point estimate from the sample is The margin of error is. The confidence interval estimate is

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