An analysis of variance comparing three treatment conditions produces dfwithin = 21. If the samples are all the same size, how many individuals are in each sample?

One biological explanation for the symptoms of schizophrenia is the appearance of enlarged _________, which are fluid-filled structures that cushion and protect the brain

A) atria B) meninges C) vesicles D) ventricles

Error variance in the factorial design is likely a result of ______.

A. individual differences B. researcher fatigue C. main effects D. interaction effects