A Random Sample of 85 Group Leaders and Supervisors Revealed

question 90

Multiple Choice

A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 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?

• A) 6.99 and 7.99
• B) 4.15 and 7.15
• C) 6.14 and 6.86
• D) 6.49 and 7.49

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Definitions:

Primary Ecological Succession

The process by which new ecosystems develop on previously uninhabited or barren areas, starting from bare rock or soil.

Hardwoods

Derived from deciduous trees, hardwoods are known for their durability and are widely used in furniture, flooring, and construction.

Community's Ecology

The study of interactions among organisms and their environment within a specific community, affecting its structure and function.

Native

Originating, growing, or produced in a certain place or environment.