Under what circumstances will the main effects in a factorial study not provide an accurate description of the results?

Drop in child care facilities are required to be licensed

Facial shaving brushes are either bulb-shaped or fan-shaped. an experiment is to be conducted to determine whether the lather thickness is the same for both types of shaving brushes. in previous studies, it was determined that shaving brush size (small, medium, large) is associated with lather thickness, but shaving brush type (wolf whiskers, maggard razors, frank shaving, and so on) is not associated with lather thickness. how could the experiment best be conducted? by blocking on shaving brush size by blocking on shaving brush type by blocking on shaving brush shape by blocking on lather thickness without blocking

"all the world's a stage" is a saying that draws a parallel between two totally different concepts: reality and drama. this type of comparison, made popular by a group of seventeenth century poets, is called: metamorphosis. metacognition. metaphysical conceit. metaphor. metaphysical poets.