A car manufacturer produces a new engine with an advertised horsepower of 350 with a standard deviation of 15 horsepower. The manufacturer tests ten engines off the assembly determine if the average...

Question 5: a car manufacturer produces a new engine with an advertised horsepower of 350 with a standard deviation of of 15 horsepower..


Extracted text: A car manufacturer produces a new engine with an advertised horsepower of 350 with a standard deviation of 15 horsepower. The manufacturer tests ten engines off the assembly determine if the average horsepower is operating at specification. The ten engines have an average horsepower of 355 with a standard deviation of 15 horsepower. Determine a 95% confidence interval for the average horsepower of all engines produced by the manufacturer. (354.69, 355.31) (344.27, 365.73) (345.70, 364.30) Engine horsepower is not normally distributed so we cannot compute a confidence interval