Given the following information, calculate the degrees of freedom that should be used in the pooled-variance t test. 
Definitions:
Ratio Level
A measurement scale that has a true zero point and equal intervals, allowing for the calculation of ratios.
Nominal Level
The simplest level of measurement, which involves categorizing or naming variables without implying any rank or order among them.
Dividing
The mathematical operation of allocating a quantity into equal parts, essentially determining how many times one number is contained within another.
Non-experimental
Pertains to studies or research designs where the investigator does not actively manipulate variables but observes them as they naturally occur.
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