Find confidence interval for population mean for supervisors, Basic Statistics

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Find confidence interval for population mean for supervisors

A random sample of 85 group leaders, supervisors, and similar personnel revealed that a person spent an average 6.5 years on the job before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?

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Basic Statistics: Find confidence interval for population mean for supervisors

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Basic Statistics: Find confidence interval for population mean for supervisors

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