Multiple regression always results in greater prediction accuracy than simple regression

Why would gratitude evolve in a social group?

a. to motivate us to return help we have received from others b. to increase the costs of helping c. to make people feel empathy d. to facilitate group selection

According to Sarah, she finds her life close to ideal, and, so far,

has gotten most of what she has wanted in life. In fact, if she had the opportunity to live her life over, she says that she would change almost nothing. Sarah is high in a. life satisfaction. b. self-efficacy. c. actualized living. d. resiliency.