The following data represent the means for each treatment condition in a two factor experiment.Note that one mean is not given.What value for the missing mean would result in no main effect for factor B? 
Definitions:
Axis II Disorders
A classification previously used in the Diagnostic and Statistical Manual of Mental Disorders (DSM) for personality disorders and intellectual disabilities, emphasizing long-term aspects of mental health.
Initial Substance Use
The first time an individual consumes drugs or alcohol, which can be a critical point for developing substance use disorders.
Self-esteem
An individual’s subjective evaluation of their own worth or value, encompassing beliefs about oneself as well as emotional states.
Illicit Substance
A drug or substance whose production, sale, or use is prohibited by law.
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