In comparing the two standard deviations below, what test value and degrees of freedom should be used in an F test? 
Definitions:
Conduction
The direct transfer of heat or electricity through a substance when there is a temperature or electrical potential difference.
Thermal Energy
The internal energy present in a system due to the motion of its atoms or molecules, often perceived as heat.
Felsic Magma
Magma that is high in silica and light in color, typically associated with explosive volcanic eruptions.
Intermediate-Composition
Refers to igneous rocks with a silica content between mafic and felsic rocks, often associated with volcanic activity.
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