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:
Tax Structure
The organized system of taxes imposed by a government, including the rates, bases, and rules governing tax liabilities.
Government Lotteries
State-run games of chance that allow participants to win monetary prizes based on randomly drawn numbers or symbols.
Tax Revenues
The income that is gained by governments through taxation, used to fund public expenditures.
States
Political entities characterized by a defined territorial area, a permanent population, a government, and the capacity to enter into relations with other states.
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