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:
Luxury Goods
High-quality, expensive items that are not essential but are desired for their status symbol and prestige.
Inelastic Demand
A situation where the demand for a product or service does not significantly change in response to a price change, indicating consumers’ willingness to buy regardless of price adjustments.
Log-Linear Form
A mathematical representation where variables are transformed using a logarithm, making multiplicative relationships appear linear.
Elasticity Values
Quantitative measures of elasticity, such as price elasticity of demand or supply, indicating how responsive one variable is to changes in another variable.
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