A Bank Manager Wants to Determine the Percent of Time

question 149

Multiple Choice

A bank manager wants to determine the percent of time the bank's tellers are working and idle.He decides to use work sampling,and his initial estimate is that the tellers are idle 20% of the time.Approximately how many observations should be taken to be 95% confident that the results will not be more than 5% away from the true result?

• A)6
• B)16
• C)44
• D)210
• E)246

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Definitions:

Sterile Field

An area kept free of microorganisms to protect the safety of a patient during medical procedures.

Electrocautery

A surgical technique using electricity to heat a metal wire or instrument to cut tissue or stop bleeding.

Benign Skin Lesions

Noncancerous growths or marks on the skin's surface, which are generally not harmful.

Electric Current

The flow of electric charge through a conductor, typically measured in amperes.