Substances that damage the nervous system are called _________

When choosing a marriage partner, people are most likely to select someone with

a. A higher level of differentiation b. A lower level of differentiation c. Around the same level of differentiation d. There is no relationship between level of differentiation and mate selection

For the majority of the items in any given test, the difficulty index

should be kept at approximately a. .99 b. .50 c. .01 d. none of these, since item difficulty is not a quantifiable value.