Why are clinical trials often held in more than one clinic at a time?
a) to promote randomization
b) to increase generalizability
c) to eliminate placebo effects
d) to control expectation effects
Question 2
Jolynn took a drug that caused the following symptoms: she felt wide-awake and friendly, and had no interest in lunch despite not having eaten since the night before.
After taking a second dose of the drug, she became nervous and confused and developed a severe headache. Which of the following drugs did Jolynn probably take?
a) alcohol
b) marijuana
c) barbiturates
d) amphetamines