A car company says that the mean gas mileage for its luxury sedan is at least 20 miles per gallon (mpg)


A car company says that the mean gas mileage for its luxury sedan is at least 20 miles per gallon (mpg)

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A car company says that the mean gas mileage for its luxury sedan is at least 20 miles per gallon​ (mpg). You believe the claim is incorrect and find that a random sample of 8

cars has a mean gas mileage of 17mpg and a standard deviation of 5mpg. At α=0.10, test the​ company's claim. Assume the population is normally distributed.

Which sampling distribution should be used and​ why?

State the appropriate hypotheses to test.

What is the value of the standardized test​ statistic?(Round two decimal places as needed)

What is the critical​ value?(Round three decimal places as needed)

What is the outcome and the conclusion of this​ test?

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