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The population standard deviation was 17 years using the

A random sample of 84 group leaders and supervisors revealed that they worked an average of 7.4 years 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?

8.05 and 8.75
7.09 and 7.71
7.16 and 7.64
7.04 and 7.76

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