Exhibit 28-1 
-Plot on a scatter diagram the data from the African countries listed in Exhibit 28-1. Does there appear to be a catch-up line in the scatter diagram?
Definitions:
Speak
The act of producing sounds that form words in order to convey information or express thoughts and feelings.
Psychologists
Professionals who study cognitive, emotional, and social processes and behavior by observing, interpreting, and recording how individuals relate to one another and their environments.
Principles Of Operant Conditioning
Fundamental concepts in behavior theory that involve modifying behavior through reinforcement and punishment following specific actions.
Classical Conditioning
A learning process that occurs through associations between an environmental stimulus and a naturally occurring stimulus.
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