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 800HP800⁢HP. Twenty five engines are randomly selected for horsepower testing. The sample has an average maximum HP of 870870 with a standard deviation of 80HP80⁢HP. Assume the population is normally distributed.   Step 1 of 2 :  Calculate a confidence interval for the average maximum HP for the experimental engine. Use a significance level of α=0.01α=0.01. Round your answers to two decimal places.

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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 800HP800⁢HP. Twenty five engines are randomly selected for horsepower testing. The sample has an average maximum HP of 870870 with a standard deviation of 80HP80⁢HP. Assume the population is normally distributed.
 
Step 1 of 2 : 
Calculate a confidence interval for the average maximum HP for the experimental engine. Use a significance level of α=0.01α=0.01. Round your answers to two decimal places. 
 
 
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