Consider a regression study involving a dependent varlable y, a quantitative independent variable x1, and a categorical independent variable with three possible levels (level 1, level 2, and level 3)....

Extracted text: Consider a regression study involving a dependent varlable y, a quantitative independent variable x1, and a categorical independent variable with three possible levels (level 1, level 2, and level 3). OHOW many dummy variables are required to represent the categorical variable? 10 Write a multiple regression equation relating x1, and the categorical variable to y Do NOT use EXCEL Oa 0 2 there can be two multiple regression equations using each level 1) there can be three multiple regression equations using each level (i) there can be three multiple regression equations using each level Od 0 1 ) there can be two multiple regression equations using each level