We again consider the problem of estimating the miles per gallon of a 2011 Ford Focus. How

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We again consider the problem of estimating the miles per gallon of a 2011 Ford Focus. How large a sample is required to estimate the mean miles per gallon within 0.5 mile per gallon with 95% confidence?

Approach Use Formula (3) with zα/2 = z0.025 = 1.96, s = 2.92, and E = 0.5 to find the required sample size.

Formula 3

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