The residual plot below suggests which violation(s) of regression assumptions? 
Definitions:
Chiefdoms
Socio-political organizations in which authority is centralized in a single leader who wields economic, political, and ceremonial control, often hereditary.
Extremely Unstable
A situation or condition that is highly unpredictable and may change abruptly.
Igbo
An ethnic group primarily located in southeastern Nigeria, known for their rich culture and history.
Female-Headed Institutions
Organizations or entities led by women, often highlighting the presence and impact of female leadership in various sectors.
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