adjective
US/ˌkɔːr.əˈleɪ.ʃən.əl/
UK/ˌkɒr.əˈleɪ.ʃən.əl/
showing that two things are connected or change together, without proving that one causes the other
In context
This is a correlational study, so it cannot prove that sleep alone improves grades.
Short entry. Full notes coming.