The Head Librarian at the Library of Congress Has Asked

question 184

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,approximately how large a sample did her assistant use to determine the interval estimate?

• A)2
• B)3
• C)12
• D)It cannot be determined from the information given.

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Definitions:

Aggregate Demand

Collective appetite for goods and services in an economic system, pegged at a particular comprehensive price level for a fixed time frame.

Short-Run Aggregate Supply

The total output of goods and services that firms in an economy are willing to produce at different price levels in the short term, holding some input prices fixed.

Classical Theory

An economic theory that emphasizes the ideas that free markets can regulate themselves through the laws of supply and demand, positing minimal government intervention.

Short Run

A period in economics where at least one factor of production is fixed and cannot be varied to influence output.