Mathematics, 24.04.2020 18:51 hellenjones30p0kvtl
The director of a customer service center wants to estimate the mean number of customer calls the center handles each day, so he randomly samples 26 different days and records the number of calls. The sample yields a mean of 258.4 calls with a standard deviation of 32.7 calls per day. The 95% confidence interval for the mean number of calls per day has an upper bound of .
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