If you want to determine whether there is a causal relationship between using the SQ4R study method and final grades in a psychology course, you should use

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The experimental method is the best choice as it allows for the manipulation of one variable (use of SQ4R study method) to determine its effect on another variable (final grades in psychology course). This allows for the establishment of cause-and-effect relationships.

If You Want to Determine Whether There Is a Causal