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The old model of a particular car got an average of =26 mpg. Design changes were made to improve fuel efficiency, and a test of

The old model of a particular car got an average of =26 mpg. Design changes were made to improve fuel efficiency, and a test of 6 cars indicated an average of 29 mpg, with a standard deviation of 3 mpg. Does this indicate that the changes improved fuel efficiency? Use a 5 % level of significance

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