A researcher would like to test for a unit root in a series. She runs the regression . What should her null hypothesis be assuming that she adopts the Dickey-Fuller test approach? 
Definitions:
Departmental Gross Profit
The gross profit of a specific department within a business, calculated by subtracting the cost of goods sold from the sales revenue of that department.
Photography Department
A specialized division within a company or institution focused on photographic services, including taking, editing, and selling photographs.
Revenue
The total amount of money earned by a company from its business activities, such as the sale of goods and services, before any expenses are deducted.
Departmental Income Statements
Financial statements that show the operating results of each department within a company, highlighting revenues and expenses.
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