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 800 HP. Sixteen engines are randomly selected for horsepower testing. The sample has an average maximum HP of 860 with a standard deviation of 80 HP. Use the confidence interval approach to determine whether the data suggest that the average maximum HP for the experimental engine is significantly different from the maximum horsepower calculated by the engineers. Use a significance level of a = 0.01. Assume the population of the maximum horsepower of engines is normally distributed. Step 1 of 2: Calculate a confidence interval for the average maximum HP for the experimental engine. Round your answers to two decimal places.

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