If we are testing for the difference between the means of two independent populations with equal variances, samples of 
and 
are taken, then the number of degrees of freedom is equal to:
Definitions:
Percentiles
Values below which a certain percentage of data in a data set fall.
Quartiles
The 25th, 50th, and 75th percentiles, referred to as the first quartile, the second quartile (median), and third quartile, respectively. The quartiles can be used to divide a data set into four parts, with each part containing approximately 25% of the data.
Frequently Occurring
Refers to events or values that appear or happen often within a given dataset or timeframe.
Mode
A measure of location, defined as the value that occurs with greatest frequency.
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