It Is Not Possible to Have an Interaction Effect Unless

question 74

True/False

It is not possible to have an interaction effect unless one of the variables also has a main effect.

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Definitions:

Chronic Pain

Persistent pain that continues for weeks, months, or even years, often beyond the typical recovery period for an injury or illness.

United States

A country in North America consisting of 50 states and a federal district, known for its diverse geography, culture, and being a global economic and political power.

Cluster Headaches

A neurological disorder characterized by severe headaches on one side of the head, often around the eye, in a series or "clusters."

Recurrent

Occurring repeatedly over a period of time.