Mathematics, 28.06.2020 04:01, Ravish6667
An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining. A sample of 243 brakes using Compound 1 yields an average brake life of 37,866 miles. A sample of 268 brakes using Compound 2 yields an average brake life of 45,789 miles. Assume that the population standard deviation for Compound 1 is 4414 miles, while the population standard deviation for Compound 2 is 2368 miles. Determine the 95% confidence interval for the true difference between average lifetimes for brakes using Compound 1 and brakes using Compound 2.
Answers: 1
= 
( 4414^2/243) + (2368^2/268) = 
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An investigator compares the durability of two different compounds used in the manufacture of a cert...
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