to estimate the fuel efficiency of a new compact automobile, an engineer performed n=16 test runs...

to estimate the fuel efficiency of a new compact automobile, an engineer performed n=16 test runs and recorded the miles per gallon (mpg) for each run. the sample mean was 42.2 mpg with standard deviation 8.8.

a) construct a 99% confidence interval for the true mean mileage for this automobile.

- Lower limit= ?

-upper limit= ?

(please round your answers to 1 decimal place)

b) the manufacturer of this automobile claims that it gets 50mpg. Based on the confidence interval, do you think this is a reasonable claim? why or why not?

Expert Solution

orchestra answered 1 year ago

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