A regression model relating units sold (Y), price (X1), and whether or not promotion was used (X2 = 1 if promotion was used and 0 if it was not) resulted in the following model. 
and the following information is provided. 
a.Is price a significant variable?
b.Is promotion significant?
Definitions:
Production
The process of creating goods and services.
Accounting Period
A specific time frame for which financial accounting records are kept, closing with a balance sheet.
Process Cost System
A type of cost system that accumulates costs for each of the various departments within a manufacturing facility.
Job Order
An order for products or services issued by a company to manage production or service tasks as per client requirements.
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