A random sample of 16 emergency reports was selected from the files of an ambulance service. The

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A random sample of 16 emergency reports was selected from the files of an ambulance service.

The mean time (computed from the sample data) required for ambulances to reach their destinations was 13 minutes. Assume that the population of times is normally distributed with a variance of 9.

Can we conclude at the .05 level of significance that the population mean is greater than 10 minutes?

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