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For this problem only , assume that the standard deviation of the number of bags of leaves produced by all homeowners is 7.5. What is

For this problem only, assume that the standard deviation of the number of bags of leaves produced by all homeowners is 7.5. What is the minimum number of homeowners that would need to be selected for the sample to allow the calculation of a 95% confidence interval with margin of error no larger than 3.

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