Posted by **Samir** on Saturday, April 3, 2010 at 4:01pm.

The manufacturer of the X-15 steel-belted radial truch tire claims that the mean mileage the tire can be driven before the tread wears out is 80,000 km. The standard deviation of the mileage is 8,000 km. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is 79,000 km. From Crosset's experience, can we conclude, at a level of significance of 0.05, that the mean mileage of the tire is less than 80,000?

## Answer This Question

## Related Questions

- Statistics - Suppose a tire manufacturer wants to set a mileage guarantee on its...
- algebra - An advertisement for a steel-belted radial tire states that this tire ...
- math - An advertisement for a steel-belted radial tire states that this tire ...
- Math - Many tires come with 13/32 inch of tread. The first 2/32 inch wears off ...
- Statistics - A tire manufacturer wishes to set a minimum mileage guarantee on a ...
- STATS - The top selling Red and Voss tire is rated 70,000 miles means nothing. ...
- Statistics - Wrong tire pressure can increase tire wear and decrease gas mileage...
- Math & Stats - Please help I was up till 2am trying to figure this out last ...
- Physics - The warranty on a new tire says that an automobile can travel for a ...
- statistics - one of the major U.S. tire makers wishes to review its warranty for...

More Related Questions