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Minivan manufacturer says vehicle gets 28 mpg; data set sample calculations

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Minivan manufacturer says vehicle gets 28 mpg; data set sample calculations

provided the following info: sample mean=26.7 MPG, sample standard deviation=2.1, sample qty=35 vehicles,margin of error=.70
What is the formula to calculate a two-tail test for the mean? What is the observed value of the test statistic and p-value?

 
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