In a sample of 123 hip surgeries of a certain type, the average surgery time was 136.9
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In a sample of 123 hip surgeries of a certain type, the average surgery time was 136.9 minutes with a standard deviation of 22.6 minutes.
a. Construct a 95% confidence interval for the mean surgery time for this procedure.
b. If a 99% confidence interval were constructed with these data, would it be wider or narrower than the interval constructed in part (a)? Explain.
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