Midwest City Motor Company is exploring different prediction models that can be used to forecast indirect labor costs. One independent variable under consideration is machine hours. Following are matching observations on indirect labor costs and machine hours for the past six months: 
In a high-low model, which months' observations would be used to compute the model's parameters?
Definitions:
Economic Disruption
A significant disturbance to the normal functions of an economy caused by external or internal events.
Labor Union Membership
The status of workers who belong to an organization that represents their collective interests in negotiations with employers regarding wages, hours, benefits, and working conditions.
Labor Force
All the non-institutionalized, working-age individuals who are employed or actively seeking employment.
Right-to-Work Laws
Right-to-work laws are statutes in some U.S. states that prohibit union security agreements between companies and workers' unions, ensuring that employment is not conditioned on union membership or related fees.
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