An Undergraduate Business Student Studies Diligently in the Library During

question 70

Essay

An undergraduate business student studies diligently in the library during dead week in anticipation of an outstanding performance on her final exams.She asks a friend to spy on her at random intervals to determine what percentage of time she is actually studying.Over the course of three days,her friend records the following observations:
If the student wants a 95 percent confidence level (z = 1.96)and a degree of precision of + 0.08,how many more observations are needed?

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Definitions:

Principle of Randomness

The concept that outcomes or selections are made in a way that all possible outcomes have an equal chance of occurring, without bias.

Public Opinion Polling

The process of surveying public opinion from a particular sample, used to infer the opinion or attitude of the population.

George Gallup

A pioneering American pollster and the founder of Gallup, Inc., known for developing modern survey techniques to gauge public opinion.

Literary Digest

A general interest magazine published in the United States in the first half of the 20th century, known for its failed prediction of the 1936 presidential election.