A car manufacturer claims that the miles per gallon for a certain model has a mean equal to 40.5 miles with the standard

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A car manufacturer claims that the miles per gallon for a
certain model has a mean equal to 40.5 miles with
the standard deviation of 3.5 miles. The following data table was
obtained from a simple random sample of
15 such cars.

A Car Manufacturer Claims That The Miles Per Gallon For A Certain Model Has A Mean Equal To 40 5 Miles With The Standard 1 (4.37 KiB) Viewed 33 times

data = { 37.0, 38.0, 42.5, 45.0, 34.0, 32.0, 36.0, 35.5, 38.0, 42.5, 40.0, 42.5, 35.0, 30.0, 37.5 1; exbar = Mean[data: S = StandardDeviation[data] 37.7 4.21646