Solve the following problems:
Statistics Failure and reliability problem.
A tire supplier claims that the tread life of its tyres has a mean of 32000 miles. The buyer has doubts. State the suitable null and alternative hypothesis to test this claim.
A testing agency randomly selects 25 vehicles. He puts the new tyres on the vehicle and runs the tyres to failure. If ML is the mileage of the ith tyre,
i=125ΣMi = 794,000 and
i=125ΣMi2 = 25,230,249,423
What is the sample mean of the mileage?
What is the sample variance of the mileage?
What is the standard error of the average mileage?
What is the 90% confidence interval for the mean mileage?
Test hypothesis at ? = 0.05