The number of dummy variables to be added to the regression equation when a categorical variable has k levels is equal to ________. A)1/ k - 1 B)k - 1 C)k² D)k/1

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To include a categorical variable with k levels in a regression equation, k-1 dummy variables need to be added. This is because one level will serve as the reference category, and the remaining k-1 categories will each need their own dummy variable to compare to the reference category.

The Number of Dummy Variables to Be Added to the Regression