A Random Sample of 25 Employees of a Local Utility

question 59

Short Answer

A random sample of 25 employees of a local utility firm showed that their monthly incomes had a sample standard deviation of $112. Provide a 90% confidence interval estimate for the standard deviation of the incomes for all the firm's employees.

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Definitions:

Average Variable Cost

The total variable costs divided by the quantity of output, representing the variable cost per unit of output.

Marginal Cost

The escalation in total financial outlay due to the creation of one more unit of a product or service.

Average Total Cost

Calculated by dividing the total cost to produce a product by the quantity of the product produced, it represents the per-unit cost of production.

Bygones

In economics, the principle of "letting bygones be bygones" implies that past costs, which cannot be recovered, should not factor into future economic decisions.