[Solution] In a sample of 21 local electricians, the mean hourly cost is found to be $65 with a standard deviation of $13. Construct a 90% confidence interval
Question: In a sample of 21 local electricians, the mean hourly cost is found to be $65 with a standard deviation of $13. Construct a 90% confidence interval for the population mean cost of an electrician.
Deliverable: Word Document 
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