Given the information in the accompanying table, calculate the correlation coefficient between the returns on Stocks A and B. 
Definitions:
Negative Thinking
A cognitive process involving pessimistic or detrimental thoughts, often leading to decreased motivation and emotional well-being.
Unipolar Depression
An enduring depressive disorder marked by constant sadness or a lack of enthusiasm for external activities.
Attribution-Helplessness Theory
A psychological theory suggesting how people attribute events to causes, which can lead to feelings of helplessness and depression when they perceive no control over the outcomes.
Attributional Dimensions
The perceived reasons or causal explanations people assign to events and behaviors, influencing their reactions and attitudes.
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