The Head Librarian at the Library of Congress Has Asked

question 174

Multiple Choice

The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books checked out each day. The assistant provides the following interval estimate: from 740 to 920 books per day. If the head librarian knows that the population standard deviation is 150 books checked out per day, and she asked her assistant to use 25 days of data to construct the interval estimate, what confidence level can she attach to the interval estimate?

• A) 95.4%
• B) 99.7%
• C) 98.0%
• D) 99.0%

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Definitions:

Dependent

A person who relies on another, especially a family member, for financial support and qualifies for potential tax benefits.

Part-Time Job

Employment with fewer hours per week than a full-time job, often offering limited benefits and lower wages.

Interest Income

Income earned from deposit accounts, investments, or loans, often subject to taxation at ordinary income tax rates.

Global Bank

A financial institution that provides a wide range of banking services in multiple countries.