Features that are common, but not essential, to the meaning of a concept, are __________

Marguerite is tested for brain damage. Although her test results indicate that she has no brain damage, in reality, she has a brain tumor. Her test results indicate a __________, which is a problem because

a. false positive; she will not get the treatment she needs. b. false positive; she may end up paying for costly treatment that is not necessary. c. false negative; she will not get the treatment she needs. d. false negative; she may end up paying for costly treatment that is not necessary.

Which of the following is the measure of the most frequently occurring score in a

distribution of scores? a. Arithmetic mean b. Sample mean c. Median d. Mode