Although males are on the average more aggressive than females, greater difference may be found among males than between males and females.

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Quizplus · Accepted Answer

Research has found that there is more variability within each gender (i.e. there are some males who are extremely non-aggressive and some who are extremely aggressive) than there is between genders on average. Thus, while males tend to be more aggressive than females on average, there is greater variation within each gender than between them.

Although Males Are on the Average More Aggressive Than Females