Exercise 4.13 provides a 95% confidence interval for the mean waiting time at an
ID: 3172303 • Letter: E
Question
Exercise 4.13 provides a 95% confidence interval for the mean waiting time at an emergency room (ER) of (128 minutes, 147 minutes). Answer the following questions based on this interval.
(a) A local newspaper claims that the average waiting time at this ER exceeds 3 hours. Is this claim supported by the confidence interval?
No, since the confidence interval contains average wait times below three hours
Yes, since 3 hours is not contained in the confidence interval
No, since the entire confidence interval is less than 3 hours
Yes, since waiting this long in an emergency room would feel like more than three hours
Explanation / Answer
A local newspaper claims that the average waiting time at this ER exceeds 3 hours. Is this claim supported by the confidence interval?
No, since the confidence interval contains average wait times below three hours
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