The ________ is the process of posing and answering questions using careful, controlled techniques that include systematic, orderly observation and collection of data

Two variables interact when: a. the effect of one independent variable depends on the level of the other independent variable

b. both variables are affected equally by some third factor. c. there are no main effects. d. there are main effects.

If you look at a pinpoint of light in a dark room, the light appears to move even though it is in fact stationary. This illusion of movement is called the ____ effect

a. autokinetic b. omega c. sleeper d. visual pique