Based on the residual plot below, you will conclude that there might be a violation of which of the following assumptions. 
Definitions:
Character Strengths
Positive traits that are inherent or developed in an individual, such as resilience, integrity, and compassion, which contribute to a fulfilling and productive life.
Positive Psychology
A branch of psychology focused on the study of positive emotions, strengths-based character traits, and enabling institutions to promote well-being.
Psychotherapy
A therapeutic treatment guided by a trained professional, aimed at addressing mental health issues through communication and other techniques.
Population-based Treatments
Population-based treatments refer to health interventions designed to address issues at the population level rather than focusing on individual patients, aiming to improve the health outcomes of a community or population.
Q55: The F test statistic in a one-way
Q55: The least squares method minimizes which of
Q58: Referring to Scenario 12-4, the degrees of
Q68: Referring to Scenario 12-4, the managers of
Q75: In a multiple regression problem involving two
Q88: Referring to Scenario 12-3, the value of
Q99: The variation attributable to factors other than
Q134: Referring to Scenario 10-11, construct a 95%
Q155: Referring to Scenario 12-13, the value of
Q241: Repeated measurements from the same individuals is