# statistic

one of the major U.S. tire makers wishes to review its warranty for their rainmaker tire. The warranty is for 40,000 miles. The tire company beleives that the tire actually lasts more than 40,000 miles. A sample of 49 tires reveales that the mean number of miles is 45,000 miles with a standard deviation of 15,000 miles. Test the hypothesis with a 0.05 significance level. what are the null and alternative hypotheses for this study? what is the critical value for this this?

1. Ho: sample mean = warranty mean

Ha: sample mean > warranty mean

Z = (sample mean - warranty mean)/standard error (SE) of difference between means

SEdiff = √(SEmeanS^2 + SEmeanW^2)

SEm = SD/√n

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

posted by PsyDAG

## Similar Questions

1. ### statistics

one of the major U.S. tire makers wishes to review its warranty for their rainmaker tire. The warranty is for 40,000 miles. The tire company beleives that the tire actually lasts more than 40,000 miles. A sample of 49 tires
2. ### Behavioral Statistics

I need someone to explain HOW to do this..I don't want just the answer I have got to figure out how to do this before my mid-term, and I'm completely clueless! 3. One of the major U.S. tire makers wishes to review its warranty for
3. ### Physics

The warranty on a new tire says that an automobile can travel for a distance of 92,000km before the tire wears out. The radius of the tire is 0.33m. How many revolutions does the tire make before wearing out? hello CJ I think we
4. ### Math

Casey paid \$45 for one new tire and one used tyre for his bicycle. The new tire costs \$17 more than the used tire. How much did the new tire cost? I have worked out the answer in my head, (\$31) but is there a particular formula I
5. ### math

On Saturday, Alberto filled his right rear tire with air at the gas station around the block from where he lives. Three days later the tire pressure in that tire measured 26 psi (pounds per square inch). On the following Saturday,
6. ### Geometry check my answer?

The diameter of a car tire is approximately 0.6meters. The warranty is good for 70,000 km. About how many revolutions will the tire make before the warranty is up? More than a million? a billion? ----------------------- my work
7. ### Information literacy lesson 2

An example of a plain language search is A. Tire AND flat B. Tire* C. How do I change flat tire? D. Tire NOT mechanic
8. ### physics

driving on a hot day causes tire pressure to rise. what is the pressure inside an automobile tire at 288, if the tire has a pressure of 30 psi at 318k? Assume that the volume and amount of air in the tire remain constant
9. ### Physics

Suppose a large dump truck tire has a surface area of 26.3 m^2. If a force of 1.58×10^7 Newtons acts on the inner tire, what is the absolute pressure inside the tire? What is the gauge pressure on the tire's surface?
10. ### Physics

Suppose a large dump truck tire has a surface area of 26.3 m^2. If a force of 1.58×10^7 Newtons acts on the inner tire, what is the absolute pressure inside the tire? What is the gauge pressure on the tire's surface?

More Similar Questions