The equal-variances test statistic of 
is Student's t distributed with 
+ 
degrees of freedom, provided that the two populations are normal.
Definitions:
Algorithm
A step-by-step procedure for calculations, data processing, and automated reasoning tasks.
Representativeness Heuristic
A cognitive shortcut where people categorize situations or individuals based on how similar they are to typical cases or categories they know.
Prototypes
Original models or first forms from which subsequent forms are derived or developed; in psychology, widely accepted examples of a certain category.
Heuristic
A mental shortcut or rule of thumb that simplifies decision-making but may not always lead to optimal outcomes.
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