Essay
Online Time Usage Narrative
An Internet server conducted a survey of 400 of its customers and found that the average amount of time spent online was 12.5 hours per week, with a standard deviation of 5.4 hours.
-Refer to Online Time Usage Narrative. If the distribution of the original measurements is not normal, you can still use the standard normal distribution to construct a confidence interval for 
, the average online time for all users of this Internet server. Why?
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