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I have one question. To examine the fuel economy for a new model, 121 cars are randomly selected for testing by manufacturer. The sample mean

I have one question.

To examine the fuel economy for a new model, 121 cars are randomly selected for testing by manufacturer. The sample mean is 18.55 miles per gallon and sample variance is 1.69. (a) Find a 95% confidence interval for the mean of fuel economy. (5 points) (b) Compute a 95% prediction interval for the measured fuel economy of a single car randomly selected. (5 points)

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