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Mathematics, 27.07.2019 22:20 thegent3473
According to the environmental protection agency, the mean miles per gallon of all large cars manufactured in 2012 driven under highway driving conditions is 25.1 mpg. a researcher claims that a new fuel additive will increase the miles per gallon of cars. after obtaining a random sample of 35 large cars from 2012, the researcher adds the fuel additive. the sample mean is found to be 26.8 mpg, with a standard deviation of 3.9. test the researcher's claim at the .05 level of significance.
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