Mark Conducts a Study for His Research Methods Class to Determine

Multiple Choice

Mark conducts a study for his research methods class to determine if consuming caffeine causes people to perform better on cognitive tasks.In his study,he gives half of his participants a glass of water and half of his participants a glass of cola,and then has them attempt to solve 15 math problems.He finds that people who drink caffeine beforehand solve more math problems than those who drink water beforehand.

-Mark decides to conduct the exact same study again to ensure that he can find the same difference between the groups a second time.This study is known as a:

A) Direct replication
B) Replication-plus-extension
C) Conceptual replication
D) Secondary replication