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Hypothesis Testing for Mean (Small Samples) 1. A local tire store suspects that the mean life of a new discount tire is less that 39,000 miles.

Hypothesis Testing for Mean (Small Samples)
1. A local tire store suspects that the mean life of a new discount tire is less that 39,000 miles. To check the claim, the store selects randomly 18 of these new discount tires. When they are tested, it is found that the mean life is 38,250 miles with a sample standard deviation s = 1200 miles.
      
a. Use the critical value z0 method from the normal distribution to test for the population mean . Test the company's claim at the level of significance  = 0.05.
1. H0 :
Ha :
2.  =
3. Test statistics:
4. P-value or critical z0 or t0.    
5. Rejection Region:
6. Decision:  
                    
7. Interpretation:
b. Use the critical value z0 method from the normal distribution to test for the population mean . Test the company's claim at the level of significance  = 0.01
1. H0 :
Ha :
2.  =
3. Test statistics:
4. P-value or critical z0 or t0.  
5. Rejection Region:  
6. Decision:                                              
7. Interpretation:  
See attached:

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