Activity: Monday, 3/05/2001
Probability of a sample mean given a certain sampling distribution
Past data has led a certain city to believe its ER response time to
911 calls in minutes is N(9.25, 2.25). An independent auditor has
selected a sample of 9 response times for the last month and found
them to have a mean of 10 minutes.
Is there strong evidence that the mean for all calls has increased?
What if the sample included 100 audited responses?
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