Question: An emergency team responds to calls in a mean time of 8.4 minutes with a

standard deviation of .7. A new dispatching system is being tested to see if the

response time can be lowered. If a sample of 18 calls with the new system were

answered in a mean time of 7.8 minutes, test at the .05 level. State the hypotheses

and identify the claim, find the critical value(s), compute the test value, make the

decision, summarize the results.