Tuesday

September 30, 2014

September 30, 2014

Posted by **Jen** on Monday, February 10, 2014 at 9:23pm.

3. 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 believes that the tire actually lasts more than 40,000 miles. A sample 49 tires revealed 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.

Answer these questions:

3a) What is the H0? Null hypothesis, hypothesis about a population of the relationship among populations

3b) What is the H1? alternative hypothesis, hypothesis about parameters that is accepted if the null hypothesis is rejected

3c) What is the decision rule?

3d) What is the calculated value of z?

3e) What is your decision?

- Behavioral Statistics -
**PsyDAG**, Tuesday, February 11, 2014 at 10:33amHo: mean = 40,000

H1: mean > 40,000

Z = (score-mean)/SEm

SEm = SD/√n

Since you are only concerned with greater than 40,000, you will reject Ho if Z falls in the top 5%.

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.

I'll let you calculate Z and come to your own decision.

**Answer this Question**

**Related Questions**

Math. - I JUST can't figure out the answer! Can someone please help me? What is ...

Math - Determine the sum of the first 20 terms of the arithmetic sequence in ...

statistics - An 8th grade history teached studied the statistics for her mid-...

math/science - "calculate the volume of 5g of a substance with a density of 6g/...

math,help - Can someone show me how do i multiply the following fractions: (n^2-...

English - 1. I am busy studying for the mid-term exam. 2. I am busy studying for...

math,algebra - can someone help me out factor out this 0=16t^2-122t+180 i have ...

statistics - i have a question regarding statistics. i just don't know how to do...

12th grade - can anyone explain how to divide in algebra? I have this problem: (...

Math - Can someone tell me how they got the answer. Problem: 9^(x+6)=7x My ...