I am working on a confusing hypothesis test. The scenario is there is a new method to retread tires. The company wants to know if more than 85% of the tires have mileage lives above 30,000 miles.
Here's some of the calculated data I have so far: xbar = 35201, s = 2615, n = 50. The instructions preset alpha at 0.05.
How do I write this null and alternate hypothesis?
mu is greater than ???
mu is less than/equal to ???