The Table Below Shows the Mean Number of Daily Errors

question 27

Multiple Choice

The table below shows the mean number of daily errors by air traffic controller trainees during the first two weeks on the job.We want to perform a paired t-test at α = .05 to see if the mean daily errors decreased significantly. The test statistic is

• A)1.25
• B)1.75
• C)0.87
• D)0.79

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Definitions:

Square Feet

A measure of area equivalent to a square that is one foot on each side.

Irregularly-shaped

Describing an object or area that lacks a regular or uniform shape.

Random Points

Specific locations or values chosen without any particular pattern, order, or predictability.

Area

The amount of space inside a two-dimensional region, such as a floor; area is measured in square units; the living space in a property.