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30. A random sample of 64 group leaders, supervisors, and similar personnel revealed that on the average a person spent 6.5 years on the job

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30. A random sample of 64 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. What is the 95% confidence interval for the true population mean? A. 6.46 and 6.54 B. 3.17 and 9.83 C. 6.08 and 6.92 D. 6.20 and 6.70 E. 6.32 and 6.88

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