Given the following information, calculate sp2, the pooled sample variance that should be used in the pooled-variance t test. 
Definitions:
Net Income
Net Income is the total profit of a company after all expenses and taxes have been deducted from total revenues, indicating the company's overall profitability.
Classified Balance Sheet
A balance sheet that groups together similar items under the headings of assets, liabilities, and equity to enhance the understanding of a company's financial position.
Current Assets
Resources anticipated to be transformed into cash, sold, or used up within a year or throughout the usual operational cycle of the company.
Ending Inventory
The total value of goods available for sale at the end of an accounting period, calculated by adding purchases to beginning inventory and subtracting cost of goods sold.
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