Question

Problem 5. The mileage of a certain make of car may not be exactly that rated by the manufacturer. Suppose ten cars of the same model were tested for combined city and highway mileages, with the following results: 1 Car No. Observed Mileage 35 40 37 4232 43 38 32 41 34 (mpg) 1 23 4 56 78 9 10 a) Estimate the sample mean and standard deviation of the actual mileage of this particular make of car. Suppose that the stated mileage of this particular model of cars is 35 miles per gallon (mpg). Perform a hypothesis test to verify the stated mileage with a significant level of 2%. Determine the corresponding 95% confidence interval of the actual mileage. b) c)

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