The unequal-variances test statistic of 
has an approximate ____________________ distribution with 
degrees of freedom.
Definitions:
Error
A mistake in action, calculation, opinion, or judgment caused by poor reasoning, carelessness, or insufficient knowledge.
Judgment
The ability to make considered decisions or come to sensible conclusions based on a comprehensive analysis of available information.
Association Heuristic
A mental shortcut that relies on the immediate connections between two concepts or objects in the mind to make a decision or solve a problem.
Error
A mistake or discrepancy from accuracy or correctness in reasoning, action, or calculation.
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