Researchers at the University of Cambridge have been studying how brain shape is linked to cocaine addiction. They determined that sporadic cocaine users (non-addicts) tend to have a larger frontal...

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Extracted text: Researchers at the University of Cambridge have been studying how brain shape is linked to cocaine addiction. They determined that sporadic cocaine users (non-addicts) tend to have a larger frontal lobe (region associated with self-control) while cocaine addicts have a small frontal lobe. It was determined that a cocaine user with a small frontal lobe had a probability equal to 0.7 of becoming addicted to the drug. Researchers conducted a simple random sample of 20 independent cocaine users that had a small frontal lobe.


Extracted text: 19. What is the probability that 15 of the users in the sample were addicted to cocaine? O (0.7)15 O ()0.7°(0.3)'5 o ()0.7)" (0.3) O )0.7)5 (0.3)' + () (0.7) (0.3)*+... +()(0.7)" (0.3)°