The test statistic employed to test 
is 
,which is F distributed with 
degrees of freedom.
Definitions:
Debit Memorandum
A document or entry recorded to reflect an adjustment or correction, usually increasing the amount a buyer owes to a seller.
Credit Memorandum
A document issued by a seller to a buyer, reducing the amount that the buyer owes under the terms of an earlier invoice.
Petty Cash
A small amount of cash kept on hand used for paying minor or incidental expenses in a business setting.
Postage Expense
The cost incurred by a business for sending mail.
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