The sampling distribution of 
is approximately normal if the sample size is more than 30.
Definitions:
Trait Variation
The difference in characteristics, often genetic, that occurs within individuals in a population.
Overregularizing
A phenomenon in language acquisition where children apply regular grammatical rules too widely, resulting in incorrect linguistic forms.
Cognitive Flexibility
The cognitive skill of moving between two distinct ideas, or the capacity to consider several ideas at the same time.
Selective Attention
The focusing of conscious awareness on a particular stimulus while ignoring other perceivable stimuli.
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