n_variables: An integer as the number of variables to be created. It is the number of column variables of the table, an additional column is added as a result of the XOR operator over the instances.
n_instances: An integer as the number of instances to be created. It is the number of rows of the table.
noise: A float number as the noise level for the variables.
Returns
A set of random variables constructed using the logical XOR operator.