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Statistics: Estimate the Mean

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Question: An automobile manufacturer wants to estimate the mean gasoline mileage that its customers will obtain with its new compact model. How many sample runs must be performed in order that the estimate be accurate to within 0.25 mpg at 90% confidence? (Assume that alpha = 2.0.)

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Solution Summary

This solution utilizes the minimum sample size formula to calculate the value of "n". This response is complete, neat and presented in a step-by-step manner.

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Margin of error, ME = 0.25, sd = 2.0 and z- value corresponding to 90% ...

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