Suppose that in a regression analysis,the explanatory variableX1represents height, and the explanatory variableX2represents whether or not an individual is a male or female. Which statement is the most accurate given this information?

The variableX1should berepresentedas a dummy variable.

The variableX2should berepresentedas a dummy variable.

There is no relationship between the variablesX1 and X2

BothX1andX2should be represented bya dummy variablein the regression.

X1andX2 should be written as an interaction term in the regression.