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State of CHARGE - Electric Vehicles’ Global Warming Emissions and Fuel-Cost Savings across the United States

Namely, if the target variable is e.g. the proportion of drivers making n trips per day, assuming that this proportion is totally unknown a priori (and so in the worst case) a random sample of 600 individuals can provide the estimation of this proportion with a confidence interval of 0.04 in the 95 of the cases. This means that if the estimated proportion is 20%, the confidence interval will be 16-24%. Since the sample is stratified rather than a pure random one, the interval can be narrower. Instead, if we consider the estimation of an average value (e.g. the. | State of CHARGE Electric Vehicles Global Warming Emissions and Fuel-Cost Savings across the United States State of CHARGE Electric Vehicles Global Warming Emissions and Fuel-Cost Savings across the United States Don Anair Amine Mahmassani JUNE 2012 Union of Concerned Scientists Citizens and Scientists for Environmental .