4. In regression, a categorical independent variable with 4 groups needs dummy variables to represent it. t[A]1 [B] 2 [C] 3 [D] 4 [E] 5 5. In K-means cluster analysis, within-cluster variation will always as the number of clusters increases. [A] increase [B] decrease [C] stay the same [D] be difficult to determine [E] be zero 6. In conjoint analysis, "part worth utility" means [A] the value of the product to the company. [B] the utility that would be lost if the product is launched in the marketplace. [C] the amount of money the company has invested in the product. [D] how much a consumer values a level of an attribute. [E] that the analyst is unable to determine the full value of the product