Tiffany has a keen interest in the original theories of William Sheldon on the relationship between body type and juvenile delinquency. She has duplicated the study using Sheldon's original methodology to see if her results are compatible to Sheldon's. Such a study illustrates the concept of.

The answer is the concept of replication.

Explanation:

The concept of replication refers to research where a scientist bases his studies on similar research to replicate data. Through replication studies, better availability of information from different studies can be obtained.

For example, in the case of Tiffany and her interest in the theories of William Sheldon, she doubled her research and is, therefore, replicating the study, which will help Sheldon's research to be more valid.

I hope this information can help you.