The authors are using the correlation method to answer this question because it tests the relationship between cannabis use and false memory.
I feel that this is method is the correct choice because it limits the elements that are being compared in contrast to the descriptive method or the experimental method. Also, this method allows for the creation of specific groups in order to provide for equal comparisons of the dependent variable.
The authors are trying to control bias by categorizing the participants by the amount of cannabis that they use. In addition, the authors ruled out any prior psychiatric or neurological disorders and matched the groups by taking into account variables