A school psychologist discovered that there is a positive relationship between the number of years individuals attend school and their self-esteem. However, another school psychologist pointed out that this relationship could be explained by his research that notes as individuals get older, their self-esteem tends to increase. In the relationship between years in school and self-esteem, age is considered a(n):

Question

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Age is considered a third variable because it may influence both the number of years individuals attend school and their self-esteem, potentially explaining the observed relationship between the two.

A School Psychologist Discovered That There Is a Positive Relationship