What is the standard deviation of a portfolio that is invested 30% in stock Q and 70% in stock R? 
Definitions:
Social Learning Theory
A theory that posits individuals learn behaviors, skills, attitudes, and beliefs through observing and imitating the actions of others within social contexts.
Biofeedback Theory
A technique that teaches individuals to control bodily processes that are normally involuntary, like heart rate, using monitoring devices.
Unconditioned Stimulus
A stimulus that inherently and instinctively elicits a reaction without needing any learned behavior.
Conditioned Response
A learned response to a previously neutral stimulus that has become associated with an unconditioned stimulus.
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