In a proper double-blind experiment
a. the effects of an active drug treatment are compared with the effects of a placebo
b. neither the subjects nor the experimenters know what treatment the subjects receive until after all the drug tests are completed
c. subjects receive the active drug treatment and then are shifted to the placebo treatment without their being informed of the switch
d. only a and b above
Question 2
A drug's clinical efficacy is commonly determined on the basis of
a. the percentage of patients exhibiting symptom relief with the drug
b. the degree of symptom relief produced in patients given the drug
c. the time is takes for symptom relief to occur
d. all of the above
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Many older adults live active lives well into their eighties and beyond.
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In which experiment was the hormone glucagon used?
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