An auto maker estimates that the mean gas mileage of its sports utility vehicle is 20 miles per gallon. A random sample of 8 such vehicles had a mean of 18 miles per gallon and a standard deviation of s = 5 miles per gallon. At a = this kind of vehicle has gas mileage less than 20 miles per gallon? Assume the population is normally distributed. 0.05, can you conclude that

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An auto maker estimates that the mean gas mileage of its sports utility vehicle is 20
miles per gallon. A random sample of 8 such vehicles had a mean of 18 miles per gallon
and a standard deviation of s = 5 miles per gallon. At a = 0.05, can you conclude that
this kind of vehicle has gas mileage less than 20 miles per gallon? Assume the population
is normally distributed.
Transcribed Image Text:An auto maker estimates that the mean gas mileage of its sports utility vehicle is 20 miles per gallon. A random sample of 8 such vehicles had a mean of 18 miles per gallon and a standard deviation of s = 5 miles per gallon. At a = 0.05, can you conclude that this kind of vehicle has gas mileage less than 20 miles per gallon? Assume the population is normally distributed.
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