Question: Assuming that the linear regression model includes an intercept, how many dummy variables representing a qualitative variable should be A. one less than the number

Assuming that the linear regression model includes an intercept, how many dummy variables representing a qualitative variable should be

A. one less than the number of categories of the variable.
B. two less than the number of categories of the variable.
C. the same number as the number of categories of the variable.
D. None of the answers are correct.

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