(Steps Shown) Suppose that a gas utility company wants to estimate it mean waiting time for installation of service to within ± 5 days with 95% confidence. From
Question: Suppose that a gas utility company wants to estimate it mean waiting time for installation of service to within ± 5 days with 95% confidence. From past studies, the standard deviation is estimated as 20 days. What sample size is needed? (0.70 point)
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