Can someone please help me with this

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

Do you want brainliest + free points? answer this question correctly. why is it important to make sure a police report is properly filed after a collision? a. it's the official account of what happened. b. if you have the police file a report, you can't be fined. c. if you have the police file a report, your insurance won't go up. d. if there's no report, an auto repair shop won't fix your vehicle.

Which of the following is one of the most common causes of collisions? a. driving on the wrong side of the road b. driving too slowly uphill c. tailgating d. eating while driving