Artifact is related to Ancient. Ancient is the opposite of Young. Young is a synonym of Junior. 
Compelling is related to Law. Law is related to Behavior. Behavior is related to Mean. Mean is related to Statistics. 
Artifact <--RelatedTo--> Ancient <--Antonym--> Young <--Synonym--> Junior 
Compelling <--RelatedTo--> Law <--RelatedTo--> Behavior <--RelatedTo--> Mean <--RelatedTo--> Statistics 