Can someone help me with this ASAP please?

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

With my drivers ed in the decision-making cycle, to decide means to a. carry out an action that has been decided b. estimate if an identified hazard will affect the driver c. pick a course of action d. pick a scanning routine

In 2004 how many nightly car accidents were there