High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 600 HP...

Extracted text: High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 600 HP Sixteen engines are randomly selected for horsepower testing. The sample has an average maximum Hi of 620 with a standard deviation of 50 HP. Calculate a 99% confidence interval for average maximum HP. Round your answer to two decimal places