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You have just been hired by the EPA to help with the new gas mileage standards...

You have just been hired by the EPA to help with the new gas mileage standards on new automobiles. The EPA would like to post average gas mileage as a 88% confidence interval. Suppose you collect data on 47 new Honda Accords and the average gas mileage for this sample was 28 with a sample standard deviation of 3.5. What is the HIGHER endpoint of your confidence interval? Be sure to use 2 decimal places.

math   Statistics-And-Probability   
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Answer #1

Degrees of freedom = n - 1 = 47 - 1 = 46

Hence,

Critical t value for 88% confidence interval = 1.584

Therefore,

Higher endpoint = = 28.81

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