A Random Sample of 22 Employees of a Local Utility

question 79

Short Answer

A random sample of 22 employees of a local utility firm showed that their monthly incomes had a sample standard deviation of $110.Provide a 90% confidence interval estimate for the standard deviation of the incomes of all employees of the firm.

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Definitions:

Formal Operational

A stage in Piaget's theory of cognitive development where individuals gain the ability to think abstractly and logically.

Secure Attachment

A strong and healthy emotional bond between a child and their caregiver, characterized by trust and a sense of safety.

Reason Abstractly

The cognitive ability to think about concepts, ideas, and principles that are not physically present or tangible.

Formal Operational

A stage of cognitive development, as per Piaget, where an individual gains the ability to think abstractly and logically.