The telecommunications manager at the Lowell Call Center is concerned
The telecommunications manager at the Lowell Call Center is concerned about the difference in average system downtime between day and night operations at the center. A random sample of 45 day shift records and 45 night shift records are examined. Average downtime for the day shift sample is 53 minutes, with a standard deviation of 18 minutes. Average downtime for the night shift sample is 48 minutes, with a standard deviation of 14 minutes. Is the difference in sample average downtimes statistically significant at the 5% significance level? Explain.
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