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A Sample of 13 College Professors Has a Mean Age

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A sample of 13 college professors has a mean age of 30 years and a standard deviation of 5 years.Suppose that the sample is enlarged to 15 college professors,by including two additional professors that are each 30 years old.Will the standard deviation increase,decrease,or stay the same,and why?


Definitions:

Overhead Cost

The ongoing, general business expenses not directly tied to producing goods or services but necessary for running the business.

Traditional Costing

A costing method that assigns factory overhead to products based on volume-related measures such as direct labor hours or machine hours.

Product B

A generic term used to differentiate one product from another in a specific context, often used for analysis, comparison, or as an example.

Direct Labor-Hours

The total hours of labor directly involved in manufacturing a product, often used as a basis for allocating overhead costs.

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