How to find the alternate hypotheses and critical value?
A truck dealer titles that a new model will give trouble free service for at least 15,000 miles - Data below shows a sample of the of miles of trouble free service for the dealer's pickups that were sold a couple of years ago. Test the dealer's claim at a 2.5% level of significance.
1) What is the alternative hypothesis
2) What is the test statistic
3) What is the critical value?
4) Does the evidence support the claim?