[A, SfS] Chapter 5: Confidence Intervals: 5.2: CI for a mean
Confidence Interval for the Population Mean of a Quantitative Variable
A medical researcher is interested in estimating the mean surgery time for a particular type of hip surgery. A random sample of #123# cases of this type of hip surgery had a sample mean surgery time of #136.9# minutes, with a sample standard deviation of #22.6# minutes.
What is the margin of error for a #95\%# confidence interval for the population mean surgery time? Use at least #3# decimal places in your answer.
Margin of error #=#
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