In: Statistics and Probability
An auto maker claims that the mean gas mileage of its luxury sedan is at least 25 miles per gallon. A random sample of 36 such cars were tested and resulted in a sample mean of 24.2 miles per gallon and a sample standard deviation of 2.8 miles per gallon. At α = 0.05, is there sufficient evidence to reject the auto maker’s claim?
Claim:
H0:
H1:
Test Statistic:
Critical Region/Critical Value:
Decision about H0: