for their particular field is amplified if they have to know how all the variables relate to each other. In the best situation, scholars would select the model’s values from theory or previous research. In the complete absence of any theoretical expectations, Maxwell (2000) suggested starting with the assumption that all zero-order correlations are .30, then changing the values to see how it influences the required sample size (i.e., sensitivity analysis). Using values of .30 gives R2 values around 0.14 (2 predictors) to 0.24 (10 predictors), which may or may not be appropriate for a study.