Question 10 Background: Response Time During a medical emergency, people who dia

Question

Question 10 Background: Response Time During a medical emergency, people who dial 911 expect an ambulance to arrive quickly and personnel to provide vital care. A random sample of ambulance response times in minutes were collected. A 95% confidence interval for the population mean response time for ambulances is found to be 7.5 minutes to 9.5 minutes. Question 10 Subquestions 10.a 0.5 point(s) What is the sample mean for the response time? O7.5 minutes O 8.5 minutes 9.5 minutes O Cannot be determined

Explanation / Answer

10 a) Sample mean is 7.5.

95% ci=Xbar+-1.96 margin of error.

b) Cannot tell.

To make decision, z test statistic and corresponding p value needs to be calculated. Supporting data for that are not provided (sample size and sample standard deviation are unknown).

c) Cannot tell. [Same logic]

d) Cannot tell.

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