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

question 101

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

---

Definitions:

Illustrates

To explain or make something clear by using examples, charts, pictures, etc., often to facilitate understanding.

Percentile

A value below which a certain percent of observations fall, used in ranking data within a data set.

Very High

A term used to describe a value or level that significantly exceeds established norms or averages.

Very Low

Describes a quantitatively small, minimal, or significantly below average level or amount.