An ambulance service claims that it takes on the average 8.9 min to reach its destination in emergency calls. The agency that licenses ambulance services timed them on 50 random emergency runs, getting a mean of 9.3 min. We know from another study that the population standard deviation = 1.8 min. Is there evidence to support the claim? Use α = 0.05.
a. State the Null and Alternative Hypotheses: (Identify which hypothesis is the claim)
b. Compute the Test statistic: (Round off correctly)
c. Find the p-value:
d. Make the decision using the Decision Rule. Use the p-value method.
e. Write the Conclusion (in plain English as related to the claim). |

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