(Steps Shown) A telephone company wishes to estimate the mean duration of local calls. Assume σ=30 . The sample size is 540. Find the margin of error
Question: A telephone company wishes to estimate the mean duration of local calls. Assume \(\sigma=30 .\) The sample size is 540. Find the margin of error in estimating \(\mu\) at the \(88 \%\) level of confidence.
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