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A random sample of 85 group leaders supervisors and similar personnel revealed that on the average a person spent

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

Apr 21 2020 View more View Less

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