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You are collecting information regarding the changing ability of school age baseball players. You hypothesize that as the players get older this causes their baseball playing abilities to increase. A colleague suggests that the change may be due to the length of time playing baseball rather than age itself. What type of threat to validity is your colleague suggesting?
Neighbourhood
A geographic area or community within a town or city where people live and interact.
School
An institution for educating children or people at various levels, usually including primary and secondary schools and sometimes tertiary institutions.
Jean Piaget
A Swiss psychologist renowned for his developmental stage theory that children progress through four critical stages of cognitive development.
Assimilation
A cognitive process in which individuals integrate new information with existing knowledge, or in a sociological context, the process by which individuals or groups adapt to the culture of another group.
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