Experimental studies utilize blinding to prevent researchers from biasing their measurements of the patients. But can they guess the treatment? In a study of a psychotherapeutic intervention, clinicians who were blinded were asked to guess what treatment their patients received. Data from that experiment are shown below. Assume that these data are indicative of the population of these treatments. 
a) What is the probability that a correct guess is made for a randomly chosen subject?
b) If a randomly chosen subject received the placebo, what is the probability that the researcher correctly guesses the treatment?
Definitions:
Serotonin
is a neurotransmitter that plays a key role in mood regulation, appetite, and sleep.
Norepinephrine
A neurotransmitter and hormone involved in the body's fight or flight response, affecting mood and arousal.
Neurotransmitters
Chemical substances in the nervous system that transmit signals between neurons or from neurons to muscles, influencing many aspects of both physical and psychological function.
Unipolar Depression
A significant depressive disorder defined by continuous feelings of sadness or a disinterest in outside stimuli.
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