A Random Sample of 85 Group Leaders, Supervisors, and Similar

question 32

Multiple Choice

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 population was 1.7 years. Find the 95% confidence interval for the population mean.

• A) 6.99 and 7.99
• B) 4.15 and 7.15
• C) 6.14 and 6.86
• D) 6.49 and 7.49
• E) None of the choices are correct

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