Long-term __________ is to strengthening, as long-term __________ is to weakening

Sometimes a sample of research participants consists of several smaller groups that are different from one another in critical ways. A correlation coefficient in this situation would be lower than if the sample consisted of similar people

This illustrates the problem of a. restricted range. b. heterogeneous subgroups. c. a third variable. d. directionality.

Which of the following is the best definition of precognition?

a. the ability to foretell the future b. the ability to move objects without touching them c. the ability to read other people's minds d. the perception of events not available to the senses e. the ability to project one's thoughts into others' minds