Given the data showing the IQ of each person and the IQ of their mother, you can present the data showing whether or not their is a correlation between the IQ of the mother and the IQ of the child. In this scenario, the IQ of the mother would be the independent variable and the IQ of the person would be the dependent variable since there is a logical assumption that the IQ of the person is dependent on the IQ of the mother.

What other ways can this data be presented?