Question 635668
5. chap 10 

Null Hypothesis,{{{H[0]}}}:    µ = 60000  (Claim)
Alternative Hypothesis, {{{H[1]}}}:    µ ≠ 60000

z Test
Test Statistic, z: -0.6928
Critical z:        ±1.96
P-Value:           0.4884

Fail to Reject the Null Hypothesis because the p-value is greater than α = 0.05.
Sample does not provide enough evidence to reject the claim that the mean mileage the tire can be driven before the tread wears out is 60,000 miles.


6. chap 10

Null Hypothesis,{{{H[0]}}}:    µ = 3  
Alternative Hypothesis, {{{H[1]}}}:    µ < 3

z Test
Test Statistic, z: -1.7678
Critical z:        -1.6449
P-Value:           0.0385

Reject the Null Hypothesis because the p-value is less than &#945; = 0.05.
Sample provides evidence to support the claim that the mean waiting time is less than 3 minutes.