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Suppose that a Normal model describes fuel economy (miles per gallon) for automobiles and that a ...

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Suppose that a Normal model describes fuel economy (miles per gallon) for automobiles and that a ...

Suppose that a Normal model describes fuel economy (miles per gallon) for automobiles and that a certain model has a standardized score (z-score) of +2.2. What does this mean regarding this model’s gas mileage?

▸ It has a standard deviation of 2.2 mpg.

▸ It is 2.2 standard deviations better than the average car.

▸ It is 2.2 mpg better than the average car.

▸ It is 2.2 miles per gallon.

▸ It is 2.2 times the gas mileage of the average car.

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Stats in Your World

Edition: 2^nd

Authors: Bock, Mariano, Craine, Velleman, De Veaux

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