Given the information: 
the number of degrees of freedom that should be used in the pooled variance t -test is:
Definitions:
Capital Budgeting Analysis
Capital budgeting analysis is the process of evaluating and selecting long-term investments that are in alignment with the goal of a company's shareholders' wealth maximization.
Opportunity Cost
The cost of choosing one option over another, representing the benefits an individual, investor, or business misses out on when choosing one alternative over another.
Stand-Alone Principle
A method of evaluating a project or investment by analyzing its viability and potential profitability as if it were the only project the company is undertaking.
Incremental Costs
Additional costs that a company incurs when increasing production or undertaking new projects.
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