Which type of null hypothesis is used in the figure below? 
Definitions:
Business Cycle
The business cycle refers to the fluctuations in economic activity and growth that an economy experiences over time, marked by periods of expansion and contraction.
Economic Activity
entails the production, distribution, and consumption of goods and services in an economy.
Employment
A situation in which an individual has a paid job.
Production
The process of combining various material inputs and immaterial inputs (plans, know-how) in order to make something for consumption (output).
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