A Company Is Interested in Estimating μ, the Mean Number

question 146

Multiple Choice

A company is interested in estimating μ, the mean number of days of sick leave taken by its employees. Their statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee. The sample mean is 12.2 days, and the sample standard deviation is 10 days. How many personnel files would the statistician have to select in order to estimate μ to within 2 days with a 99 percent confidence interval?

• A) 2
• B) 13
• C) 136
• D) 165
• E) 173

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Definitions:

Output Methods

Various ways in which data or information can be presented, transferred, or made available to another process, device, or user.

Speakers

Devices that convert electrical audio signals into sound waves, enabling the playback of music, speech, and other sounds.

Interactive Whiteboards

Digital display boards that respond to user input either through touch or specialized pens, used in educational and corporate settings.

Graphical User Interface

A visual way of interacting with a computer using items like windows, icons, and menus, intended to make software easier to use.