A machine that is supposed to produce ball bearings with a diameter of 7 millimeters yields the following data
from a test of 5 ball bearings every 20 minutes. 
Definitions:
Preoperational Stage
A stage in Piaget's theory, occurring roughly between the ages of 2 and 7, characterized by symbolic thinking, egocentrism, and a lack of logical reasoning.
Crystallized Intelligence
The ability to use learned knowledge and experience.
Cultural Variations
Differences in the beliefs, behaviors, norms, and values among people from different backgrounds and societies.
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