In a regression analysis of a first-order model involving 3 predictor variables and 25 observations, the following estimated regression equation was developed. 
= 12 - 18x1 + 4x2 + 15x3
Also, the following standard errors and the sum of squares were obtained. 
The multiple coefficient of determination is
Definitions:
Monopolistic Competition
A market structure characterized by many firms selling products that are similar but not identical, allowing for competition.
Barriers To Entry
Economic, procedural, or regulatory obstacles that prevent or hinder new competitors from easily entering an industry or area of business.
Number Of Sellers
The quantity of providers or sellers in a market, affecting competition and pricing dynamics.
Monopolistic Competitor
A type of market structure where many companies sell products that are similar but not identical, allowing for competition on factors other than price.
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