When comparing two population variances,we use the ratio 
rather than the difference 
.
Definitions:
Information
Data or knowledge communicated or received concerning a particular fact or circumstance.
Principal
In legal and financial contexts, the original sum of money loaned or invested, before interest; in agency, the person or entity who authorizes an agent to act on their behalf.
Specific Authority
Power or permission given to an agent for specific tasks or transactions on behalf of the principal.
Necessarily Incidental
Activities or actions that are not central but are unavoidably part of or related to accomplishing a main activity or goal.
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