Research Concepts Matching: Detailed Explanation

Method of Difference Matched with Mill's Canon

A. Method of Difference corresponds to IV. Mill's Canon. This canon is used in causal inference, identifying a cause by finding the unique difference between situations where an effect occurs and where it does not.

Law of single variable Matched with Assumption of experimental research

B. Law of single variable aligns with I. Assumption of experimental research. A fundamental principle in experiments is manipulating only one variable at a time to clearly establish cause-and-effect relationships.

Aggregate Event Prediction Matched with Assumption of randomization

C. While individual events cannot be predicted with accuracy, aggregate events can is linked to III. Assumption of randomization. This principle highlights that although single random events are unpredictable, the outcomes of numerous random events can be statistically predicted. Randomization ensures this predictability in research.

Interaction effect of testing Matched with Threat for experimental validity

D. Interaction effect of testing relates to II. Threat for experimental validity. This occurs when a preliminary test influences the results of the main treatment or the final test, thereby undermining the experiment's internal validity.

Correct Option Identification

Based on the matching above (A-IV, B-I, C-III, D-II), the correct option is C.